TEC~N~CA~MANUAL REV 1.0
Micrhmint;lnc
I15 Timberlachen Cirde, Sub 2001, Lake Mary, FL 32746 Phone 407-262- Fax 407-2620069 www.micromint.com
...... COPYRIGHT f********x************n********* * * * RTC180, RTC52, BCC180, BASIC-180, and BCC bus rt * are trademarks of Micromint, Inc. .& * * * This manual is copyright (c) 1990 * * by Micromint, Inc. * * * * All Rights Reserved * * * * * f*Q**t*****f******X****k****** DISCUIMER ***********+**********ff******** * * * While we have attempted to provide accurate and up-to- * * date information in this manual, Micromint Inc. makes no * * representations or warranties respecting its contents. We reserve * * the right to make periodic changes to the text and to issue new * * editions of this manual without notification. t * * A occasionally in this manual we refer to other manufacturers' * * products. Such references do not constitute an endorsement of * * these products, but are included for the purpose of illustration * * or clarification. We do not intend such technical information and * * interface data to supersede information provided by individual * * manufacturers. * * * * * ...... Conditions of sale and Product Warranty
Micromint Inc. and the Buyer agree to the following terms and conditions of Sale and Purchase:
1. Micromint Inc. extends the following warranty: a factory- manufactured circuit board or assembly carries with it a one-year warranty covering both parts and labor. Any unit which is found to have a defect in materials or workmanship will, at the discre- tion of ~icromintInc., be repaired or replaced.
2. A minimum inspection fee must be prepaid for the repair of units that are no longer under warranty. Call Micromint Inc. for a current list of fees.
3. Micromint Inc. will not be responsible for the repair or replacement of any unit damaged by user modification, negligence, abuse and mishandling, or improper installation.
4. Micromint Inc. is not responsible to the Buyer for any loss or claim of special or consequential damages.
5. All units returned for repair must first receive prior autho- rization from Micromint Inc. A return authorization number may be obtained by phone or letter. Please retain a record of the return authorization number since most subsequent correspondence will refer to this authorization. Under no circumstances should any product be returned to Micromint Inc, without such authori- zation. Micromint Inc. assumes no responsibility for returns unaccompanied by an authorization number. All returns must be shipped prepaid and ought to be insured. Micromint Inc. is not responsible for losses or damage during shipment. Repaired units will be returned with postage and insurance paid.
6. Micromint Inc. reserves the right to alter any feature or specification at any time. This right extends to fees, charges, and any other conditions or warranties contained herein.
Table of Contents
Description Page
Setting Up Your RTCl80 ...... 3 Hardware Description HD64180 Processor ...... 7 Memory ...... 9 1/0 ...... 17 Serial ...... 18 Parallel ...... 21 Analog ...... 24 LED ~ndicator ...... 28 Option Jumpers ...... 29
Connector Pinouts ...... 33 Parts List ...... 39 Power Table ...... 41 Silkscreen .....a*...... *.41
Schematic ...... -43
iii
The Micromint RTC180 is a single-board cornputer/contraller featuring a new-generation 8-bit microprocessor which maintains software compatibility with the Zilog Z80 while incorporating advanced design features in a single 68-pin PLCC package. Con- figured primarily for embedded control, the RTC180 uses the same vertical stacking 1/0 expansion bus as Micromint's RTC31/52 con- troller board. All of Micromint's RTC expansion boards are corn- patible with the RTC180.
The RTC180 ROM monitor provides the system designer with a host of low-level development aids while the BASIC-180 multitas- king BASIC compiler speeds high-level development of lightning- fast code right on board.
RTC180 Technical Specifications
* Hitachi HD64180 microprocessor running at 9.216 MHz. Supports a superset of the 280 instruction set * Up to 96K bytes total memory on-board (32K EPROM, 32K static RAM, and 32K of either static RAM or EPROM * LO24 bits (64 bytes x 16 bits) EEPROM * Two asynchronous serial ports (one full-duplex RS-232, one half-duplex RS-485). * Eight-channel, 8-bit or eight-channel, 10-bit analog- to-digital converter * Three 8-bit parallel I/O ports (24 bits) * Three predecoded expansion board select lines * On-board memory management unit, 2-channel Dm con- troller, 2 counter/timers, and 12 interrupt sources * Requires just +5V (RS-232 voltages generated on- board) * Measures 3.5" x 4.5'' (RTC-Plus form factor)
Page 1 Page 2 Settinq UP Your RTC180
Very Pew connections are required to bring up a functional RTC180 development system, with the minimum connections being to a terminal and a power supply.
Power
The RTC180 requires a minimum of 300 mA at +5V +5% for a fully populated board (all components installed including 96K of memory). Less current is required for a board with fewer compo- nents installed (e-g., without the RS-485 driver or less memory). Voltages necessary for RS-232 operation are generated on the board.
Power can be connected to the RTC380 in one of two ways: through the power pins on J1 or through the RTC bus. If you pur- chased the RTC180 with quick-disconnect headers, a mating connec- tor and pins are included for J1 connection. If the board has screw terminals, simply insert wires in the top of the connector at Jl and tighten the side screws. The following top view of J1 should be used to properly connect the computer to your power supply. Be sure to double check your connections before applying power to the RTC180! It is very easy to connect the power to J1 backwards. Boards damaged by incorrect power connections are not covered under warranty.
Edge of board >
Power Gnd
If you plan to power your RTC180 through the RTC bus cannec- tors, be sure to follow the connection instructions supplied with the board to which power will be connected. In no casE should power be applied directly to the pins of the RTC bus connectors on the RTClSO board.
Page 3 When plugging other RTC boards into the RTC280, be sure to line the keys up properly. Plugging a board into the RTC180 backwards may damage the board. A board damaged by plugging it in backwards is not covered under warranty, so exercise appropri- ate care.
Any standard RS-232 serial terminal can used as a console device for the RTC180. Alternatively, a personal computer using communication software and a serial port can be used as a console device.
The RTC180 has a 16-pin Berg-type header (JP3) used to con- nect with the console device. An adapter cable which goes from the Berg header to a standard DB-25 is useful for making the con- nection. Micromint sells such a cable. If youvd prefer to con- struct one, please refer to the "Serial I/O" section later in this manual for a detailed description of JP3. With the adapter cable in place, a straight-through DB25-to-DB25 cable can be used to connect a terminal to the RTC180.
The same cabling is necessary in most cases when a personal computer is used with terminal emulation software. In some cases, though, a swap or flnull modern" cable must be used. The minimum requirements for this cable are that pins 2 and 3 should be swapped and pin 7 should pass straight through. The following diagram shows this minimum cable:
Personal Computer
Please refer to the "Serial I/Oq1 section later in this manual if your terminal requires additional handshaking lines.
When installed, the RTC180 monitor will automatically detect the baud rate being used by the terminal as long as it's one of the following: 29200, 9600, 2400, 1200, or 300. We recommend setting your terminal for 9600 bps until your system is set up and working. Additionally, be sure your terminal (or communica- tion software) is set up with the following parameters: 8 data bits, 1 stop bit, no parity, and CR (not CR/LF) generated when
Page 4 llReturn" is pressed. If your terminal doesnlt allow parity to be turned off, 7 data bits and space (clear) parity should also work.
Powering it up
Once everything has been connected, double check all the con- nections. Turn on the power to the terminal first and let it warn up. Next, turn on the power to the RTC180. If the ROM monitor is installed, the terminal is set up for 9600 bps, and everything is connected properly, the string t1RTC180r1should be displayed on the terminal screen. Press IrReturn" once or twice and the monitor banner should come up on the screen. Your RTC180 system is now working. You should now refer to either the RTC180 monitor manual or (if BASIC-180 is installed) the BASIC-180 man- ual for instructions on how to proceed.
If your terminal is set for something other than 9600 bps, you should get a few "garbageg1characters on the screen when you first apply power to the RTC180. This is what 11RTC180"trans- mitted at 9600 bps looks like at whatever baud rate you're using. Pressing "Return" once or twice tells the RTC180 what baud rate you're really using and the monitor banner should come up as described above, but at the baud rate you're using.
If "RTC1801' isn't displayed when power is applied, or there is no response to repeated presses of the I1Returnlrkey, reset the board by shorting the pins of J3 and try again. If there is still no response, check all connections once again including the power and terminal cables. If you still can't get your RTC180 to respond, you may call our technical support staff at (203) 871-6170.
Page 5 Page 6 RTC180 Hardware
The hardware on the RTC180 can be broken into three sections: the HD64180 microprocessor, memory, and I/O. Each of these sec- tions will be discussed in turn.
BD64180 Processor
The power of the RTCl80 is made possible by the Hitachi HD64180--a microcoded execution unit based on advanced CMOS man- ufacturing technology. It provides the benefits of high perfor- mance, reduced system cost, and low-power operation while main- taining compatibility with the large base of industry-standard &-bit software.
Performance is derived from a high clock speed, instruction pipelining, and an integrated Memory Management Unit (MMU). The instruction set is a superset of the 280 instruction set; twelve new instructions include hardware multiply, bit comparisons, and a SLEEP instruction for low-power mode.
Compared with the 280 in the same way the 80188 is compared with the 8088, system costs are reduced because many key system functions have been included on-chip. Besides the MMU, the HD64180 boasts a two-channel Direct Memory Access Controller (DMAC), wait-state generator, dynamic-RAM refresh, two-channel Asynchronous Serial ~ommunicationInterface (ASCI), Clocked Serial 1/0 (CSIO), two-channel 16-bit Programmable Reload Timer (PRT), a versatile 12-source interrupt controller, and a Tidual'' (68xx and 80xx families) bus interface, all on one 68-pin chip.
The HD64180 comprises five functional blocks:
o Central processing unit: The CPU is microcoded to implement an upward-compatible superset of the 280 instruction set. Besides the twelve new instruc- tions, many instructions require fewer clock cycles for execution than on a standard 280.
o Clock Generator: The clock generator produces the system clock from an external crystal or external clock input. The clock is programmably prescaled to generate timing for the on-chip I/O and system sup- port devices.
Page 7 o BUS State Controller: The bus state controller per- forms all status/control bus activity. This includes external bus cycle wait-state timing, RESET\, DFWM refresh, and master DMA bus exchange. It generates bus-control signals for compatibility with both 68xx and 80xx family devices.
o Interrupt Controller: The interrupt controller moni- tors and prioritizes the four external and eight internal interrupt sources. A variety of interrupt response modes are programmable.
o Memory Management Unit: The MMTJ maps the CPU1s 64K-byte logical address space into a 1-Megabyte physical address space. The MMU organization pre- serves software object code compatibility while pro- viding extended memory access and uses an efficient "common area/bank areaw scheme. 1/0 accesses (64K-port 1/0 space) bypass the MMU.
The integrated 1/0 resources make up the remaining four functional blocks:
o Direct Memory Access Controller: The two-channel DMAC provides high-speed memory-to-memory, memory-to-I/O, and memory-to-memory-mapped I/O transfer. The DMAC features edge- or level-sense request input, address increment/decrement/no-change, and (for memory-to- memory transfer) programmable burst or cycle-steal transfer. In addition, the DMAC can directly access the full 1M-byte physical address space and transfers (up to 64K bytes in length) can cross 64K-byte bound- aries.
o Asynchronous serial Communication Interface: The ASCI provides two separate full-duplex UARTs and includes a programmable baud rate generator, modem control signals, and a multiprocessor communication format. The ASCI can use the DMAC for high-speed serial data transfer, reducing CPU overhead.
o Clocked Serial I/Q Port: The CSIO provides a half- duplex clocked serial transmitter and receiver. This can be used for simple, high-speed connection to another microprocessor or microcomputer.
o Programmable Reload Timer: The PRT contains two sepa- rate channels, each consisting of 16-bit data and 16-bit timer reload registers. The timebase is divided by 20 (nonprogrammable) from the system clock and one PRT channel has an optional output allowing waveform generation.
Note: The HD64180 Microprocessor Data Book is available from Micromint for $10 plus shipping.
Page 8 The RTC180 allows the use of up to 96K bytes of memory on the main board. In most controller applications, 64K is sufficient, however 96K is available for larger applications. Memory may not be expanded beyond 96K. The RTC expansion bus may only be used for I/O expansion and all system memory must be on the processor board.
EPROM/Static RAM
There are three 28-pin sockets on the RTC180 board (U9-Ull). A 27256 (27C256) EPROM must be plugged into socket U9 and a 62256 static FtAM chip must be plugged into socket U11. Socket U10 may contain either a static RAM chip or an EPROM, Both types of chips contain 32K bytes of storage and are the only kinds of mem- ory that will work. It isn't possible to use, say, a 27512 EPROM.
The 5-pin jumper header next to socket U10 (JP6) determines whether an EPROM or a RAM chip is installed in that socket. When there is one jumper between pins 1 and 2 and a second jumper between pins 3 and 4, that socket is set for EPROM operation. To use the socket with a RAM chip, the jumpers must be moved so they connect pins 2 and 3 and pins 4 and 5. The RTC180 is shipped from the factory with UlO (JP6) set up for RAM operation. The following shows how JP6 is set up:
EPROM RAM
Jmpeers shown selecting EPROM
1 * 5 Jumpers shown selecting RAM
Page 9 The first socket (UP) is mapped to physical address 00000H. Socket U10 is mapped 32K above that at physical address 08000H. ina ally, socket UI1 is mapped at physical address 18000H. Note that there is a 32K gap between sockets U10 and U11 to provide compatibility with software developed for the BCC18O. It is up to whatever program is running to determine how the HD641801s memory management unit (MMU) maps the logical address space into the physical address space.
The default configuration of the RTC180 monitor maps the entire first socket to the first 32K bytes in the logical address space, The other 32K bytes of space is mapped to U11. See the monitor manual for more details about changing active banks while in the monitor and the HD64180 data book for details about con- figuring the on-board MMU under program control (specifically, the CBAR, CBR, and BBR registers).
NOTE: A 32K-byte 62256 static RAM chip must be installed in socket Ull in order for the RTClSO monitor and the ROM-based ver- sion of BASIC-180 to function properly.
Wait States and Refresh
The HI364180 processor has, among other things, an on-board wait-state generator. It7s possible to set anywhere from 0 to 3 memory wait states and from 1 to 4 1/O wait states. Memory wait states are dealt with in this section. See the "Input/Outputt' section for I/O wait state details.
EPROMs and static RAM chips rated for an access time of 150 ns or better can be used with zero memory wait states on a 9.216-MHz RTC180. Memory chips slower than this will need wait states. EPROMs with 200-ns access times need one wait state. The RTClSO monitor defaults to two memory wait states to allow for slow EPROMs. See the RTC180 monitor manual for details on how to change this default.
Since the RTC180 contains only static memory devices, the HD641801s on-board DRAM refresh circuits may be disabled to eli- minate the overhead of DRAM refresh. The HD641801s RCR register should be initialized to zero (as shown in the following code segment) by any program responsible for setting up the processor after a reset. See the HD64180 data book for more details about the RCR register.
BASIC-180 Assembly 100 OUT $36,$00 LD A, OOH OUT0 (36H),A
Page 10 Recommended Memory wait States (for a 9.216-MHz RTC180)
Board Suggested Memory Position Part Access Time Wait States
U9-Ull 27x256 EPROM 1150 ns 0 62256 SRAM
U9-Ull 27x256 EPROM 200 ns 2 62256 SRAM
U9-Ull 27x256 EPROM >200 ns 2 or more 62256 SRAM
UIO EPROM/S~~~~CRAM Unused
u11 EPROM/static RAM
RTClSO system Memory Map
Page 11
BASIC-180 Assembly 100 ' Start conversion ; Start conversion 110 OUT $9002,0 LD BC,9002H 120 Delay for conversion OUT (C),A 130 FOR X=l TO 100: NEXT X ; Delay for conversion 140 Read &-bit value LD B,O 150 D=INP($9002) DLY1: DJNZ DLYl 160 ' Or read lo-bit value DLY2: DJNZ DLY2 170 DH=INP ($9002) DLY3 : DJNZ DLY3 180 DL,=INP($9002) ; Read 8-bit value 190 D=DH*4 + DL/64 LD BC,9002H IN A,(C) ; Or read 10-bit value ; and put into HL LD BCf9002H =rJ Af (C) LD LrA IN Ar (C) LD tI,O RLA RL L RL H RLA
no wing when a conversion has completed can be handled in one of several ways. The easiest is to simply insert a fixed delay of at least 600 ps (200 ps for 10-bit ADC) between starting the conversion and reading the result (as shown above). Two other techniques involve using the EOC signal from the ADC chip.
Depending on the setting of JP3, EOC is connected to either the CTS input of serial channel 0 or to bit 6 of port C on the 8255. The EOC signal is normally high; when a conversion is started, EOC will go low sometime between 0 and 72 microseconds after the start, then will go high at the end of the conversion.
To use EOC when connected to CTSO, be sure there is a jumper between pins 2 and 3 of JP3. The CTSO input is reflected on bit 5 of the HD64180fs on-board port 2. When EOC is high, bit 5 will be a 1, and when EOC is low, bit 5 will be a 0.
One caveat of using the CTSO input is that when the signal on the input is high, the TDRE (transmit data register empty) bit for serial port 0 is disabled, effectively disabling the trans- mitter section of serial port 0. If the ADC1s EOC line must be monitored and serial port 0 must be available at all times, then EOC must not be connected to CTSO and EOC must be connected to the 8255 (discussed next) .
Page 26 The following code might be used to monitor EOC via the CTSO input : BASIC-180 Assembly 100 ' Delay for EOC to go low ; Delay for EOC to go low 110 FOR X=l TO 10: NEXT X LD B,100 120 ' Wait for EOC to go high DLY: DJNZ DLY 230 IF BAND(INP($O2),$20) = 0 : Wait for EOC to go high THEN 130 WAIT: IN0 A, (02H) 140 continue with ADC code BIT 5,A JR Z,WAIT ; continue with ADC code
The second method that may be used to monitor EOC is to con- nect the signal to bit 6 of port C on the 8255. Set up JP3 so there is one jumper between pins 1 & 2, and a second jumper between pins 3 6 4. Initialize the 8255 as described in the "Parallel I/O" section of this manual so that port C is an input port (which is the default reset condition of the 8255 anyway). Just as with the CTSO method, when EOC is low, bit 6 will be a 0, and when EOC is high, bit 6 will be a 1.
Sample code that uses the 8255 to monitor EOC is as follows:
BAS1 C-180 Assembly 100 ' Initialize 8255 ; Initialize 8255 110 OUT $8003,$98 LD A,9BH 120 ' Delay for EOC to go low LD BC,8003H 130 FOR X=l TO 10: NEXT X OUT (C),A 140 ' Wait for EOC to go high ; Delay for EOC to go low 150 IF BAND(INP(S8002) ,$40) = 0 LD B,100 THEN 150 DLY: DJNZ DLY 160 continue with ADC code ; Wait for EOC to go high ED BC,8002H WAIT: IN A, (C) BIT 6,A JR Z,WAIT ; continue with ADC code
The following shows the two ways in which JP3 may be config- ured:
Jumper shown connecting - EOC to CTSO input
Page 27 Jumpers shown connecting EOC to port C, bit 6 of 8255
LED Indicator
The RTC180 contains a single LED which may be used as a gene- ral-purpose indicator. The LED is connected to the RTS output of serial port 0 and is controlled with bit 4 of the HD64180ts on- board port 0. Setting the bit turns the LED off and clearing the bit turns the LED on.
The same control line is used to enable the RS-485 driver and sometimes to control the EEPROM chip select, so care must be taken not to interfere with these operations. As a side benefit, the LED makes a handy debugging tool to indicate when the RS-485 driver is enabled or when the EEPROM is being selected.
The following code illustrates the use of the LED: BASIC-180 Assemblv 100 Turn LED on ; Turn LED on 110 OUT $OO,BAND(INP($OO) ,$EF) IN0 At (OOH) 120 ' Turn LED off RES 4tA 130 OUT $00,BOR(INP(S00) ,$10) OUT0 (OOH),A ; Turn LED off IN0 At (OOH) SET 4,A OUTO (OOH),A
Page 28 (Jumpers shown installed are factory-set defaults.)
RS-485 Terminator Selection (I x 2 Berg Header - Top View)
L ~ernovedfor no termination (Jumper shown in its tl~torage'tposition)
RS-485 Receiver Enable Option (1 x 3 Berg Header - Top Vi'ew)
RS-485 receiver RS-485 receiver enabled always enabled when driver disabled
L Jumper shown selecting receiver always enabled
Page 29 ADC End-of-Conversion Input Selection (1 x 4 Berg Header - Top View)
Jumpers shown connecting EOC to port C, bit 6 of 8255
L Jumper shown connecting EOC to CTSO input
JP3 is set for EOC on CTSO at factory
DTR Handshaking/Clocked Serial Receive Select (1 x 3 Berg Header - Top View)
Select CTSl Select EEPROM input data input
L Jumper shown selecting EEPROM data input
Page 30 EEPROM Chip Select Control Selection (1 x 3 Berg Header - Top View)
Chip select with Chip select 8255 port C, bit 2 with RTSO
L Jumper shown selecting RTSO for chip select
U10 RAM/EPROM Selection (1 x 5 Berg Header - Top View)
EPROM
Jumpers shown selecting EPROM
EPROM
Jumpers shown selecting RAM
JP6 is set for RAM at factory
The pair of jumpers must always be moved as a pair. Never place a jumper between pins 1 h 2 while there is a jumper on pins 4 & 5.
Page 31 Page 32 Connector Pinouts
Power/Auxiliary Serial Port Connector (4 screw terminals - Top View) Edge of board > 1
Power Gnd
Console Serial Port Connector (RS-232) (2 x 8 Berg Header - Top View)
Clear to Send Transmit Data L Receive Data
Page 33 External Reset Connector (1 x 2 Berg Header - Top View)
A normally-open pushbutton should be connected between these pins. When the pins are shorted (the button pushed), the computer will reset.
8255 Parallel Port Connector (2 x 13 Berg Header - Top View)
Ground 1 2 Ground
PB3 3 4 PB4
PB2 5 6 PB5
PB1 7 8 PB6
PBO 9 10 PB7
PC7 I1 12 PA7
PC6 13 14 PA6
PC5 15 16 PAS
PC4 17 18 PA4
PC3 19 20 PA3
PC2 21 22 PA2
PC1 23 24 PA1
PC0 25 26 PA0
Page 34 Vertical Stacking Expansion Header (1) (2 x 13 Berg Header - Top View)
Ground 9 10 RESET - - INT2 -11 12 -INTO
14 NMI - Ground - 15 16 RD - Ground - 17 18 RD - Ground 19 20 WR
Ground - 2 1 22 N/C
(Key) Ground - 23 24 TOUT
Ground - 25 26 -12V
Page 35 Vertical stacking ~xpansionHeader (2) (2 x 13 Berg Header - Top View)
4 EOOO
8 +5V
10 A7
12 A6
14 A5
16 A6
18 +5V (Key)
20 D7
22 D6
24 D5
26 D4
Page 36 A/D Converter Input Connector (10 screw terminals - Top View) < Edge of board
1 0 Channel
0 Channel
0 Channel
0 Channel
0 Ground I I 0- Ground I I OtChannel La- Channel
Page 37 RTCl8O Jumper and Connector Placement
Page 38 Parts List
Part # Part type/value Description
Printed Circuit Board
Microprocessor (68-pin PLCC) Octal Bus Transceiver RS-422/RS-485 Transceiver RS-232 ~river/Receiver 1024-bit EEPROM Hex Inverter/Schmitt Trigger RTC180 PAL 32K EPROM 32K EPROM/SRAM 32K SRAM Prog. Peripheral Interface 8-channel, 10-bit ADC capacitors
Monolithic, 50V Tantalum, 16V Monolithic, 50V
Resistors (\-Watt, 5% carbon film unless otherwise noted)
470k ohm yel-vio-ye1 100 ohm brn-blk-brn 470 ohm yel-vio-brn 10k ohm brn-blk-org 1M ohm brn-blk-grn 1.3k ohm brn-org-red
4.7k ohm (472) ~esistorNetwork, 9-element (4K7)
Page 39 Sockets
8-pin Socket 14-pin Socket 16-pin Socket 20-pin Socket 24-pin Socket, 0.300" 28-pin Socket 44-pin PLCC Socket 68-pin PLCC Socket
Terminals 4-Position Screw Terminal 2x8 Header erg-type pin Header 1x2 Header Berg-type Pin Header 2x13 Header Berg-type Pin Header Terminals 10-Position Screw Terminal
Jumper Headers
JP1 1x2 Header erg-type Pin Header JP2, JP4, JP5 1x3 Header Berg-type Pin Header JP3 1x4 Header Berg-type Pin Header JP6 1x5 Header Berg-type Pin Header
Miscellaneous
Dl IN4148 Diode LED1 LED Light-Emitting Diode POT1 10k ohm Trim Pot Ql 2N2907 PNP Transistor XTALZ 18.432 MHz Crystal, M-TRON MP-1 21 LM336Z-5.0 5.OV Voltage Reference
Page 40 Power Table
IC# Tvwe +5V GND
Silksereen
Page 41 Page 42
8 I 7 I 6 I 5 I 4 I 3 I 2 1 1 iaerrlqhr (c 1934, nicromlnt. Inc
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C C
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B B
INTZ\ RO\
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A MICROMINT, INC. 4 PnRK STREET 'JERHON, CT 86866 RTC188 KENDhUIDSON REV 1.1
DQTE 0 4/23/98 SHEET 1 OF 2 8 1 7 I 6 I 5 I 4 I 1 3 I 2 I 1 ( PRODUCT RTC Keys 1 NO. 2900201 TITLE Installing the keys for the RTC Expansion Bus Connectors
In a effort to prevent misalignment of the RTC expansion bus, a universal keying system has been implemented. To ensure every RTC system has compatible keying, please follow the following procedure:
Two connectors are used to provide bus expansion. These expansion con- nectors are labeled JP15 and,JPI6 on every board. The connectors may be simply a 2x13 square pin header (on the component side of the circuit board), a 2x1 3 square pin socket (on the solder side of the PC board), or a cornbination 2x1 3 headerlsocket.
Insert Plastic Plugs To modify the square pin socket expansion connect~rs,turn the board over so the solder side is up and orient it as shown here. Clip 111 6 inch off !he tips of each plastic plug. Press a plug into each smket as shown: JP15 pin 23 and JP16 pin 18. Solder Side
Clip off Square Pins
To modify the square p~nheader expansion connectors, turn the board over so the component side is up and orient it as shown here. Clip off JP15 pin 23 and JP 16 pin 18.
Component Side