To our customers, Old Company Name in Catalogs and Other Documents On April 1st, 2010, NEC Electronics Corporation merged with Renesas Technology Corporation, and Renesas Electronics Corporation took over all the business of both companies. Therefore, although the old company name remains in this document, it is a valid Renesas Electronics document. We appreciate your understanding. Renesas Electronics website: http://www.renesas.com April 1st, 2010 Renesas Electronics Corporation Issued by: Renesas Electronics Corporation (http://www.renesas.com) Send any inquiries to http://www.renesas.com/inquiry. Date : Aug.03.2005 RENESAS TECHNICAL UPDATE Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan RenesasTechnology Corp. Product Document Rev. Category MPU&MCU No. TN-380-A062A/E 1.00 38C5 Group Information Title LCD Display Function Category Technical Notification M38C58M8-XXXFP/HP, Lot No. 38C5 Group Datasheet M38C59MC-XXXFP/HP, Applicable Reference 38C5 Group Datasheet M38C59MF-XXXFP/HP, Product Document (One Time PROM version) M38C59GFFP/HP, −− M38C59RLFP Use the above applicable products as described below when using the LCD drive control circuit with static, 1/2 duty, 1/3 duty and 1/4 duty. In the LCD drive control circuit, the output level from the COM and SEG pins with the following conditions is shown in Table 1. Conditions: • At static, 1/2 duty, 1/3 duty and 1/4 duty (duty ratio selection bits=0002, 0012, 0102, 0112 (Bits 0 to 2 in LM1(*))) • When LCD is turned off (LCD enable bit=02 (Bit 4 in LM1(*)) * LM1 : LCD mode register (001316) Table 1 Output Level of COM, SEG Pins While LCD is Turned off Pin Function Output Level COM Pin (COM0 to COM3)VL3 SEG Pin (P20/SEG0/(KW4) to P37/SEG31)VL3 (1) COM/SEG Pin (COM7/SEG32 to COM4/SEG35) (At COM selected) VL3 COM/SEG Pin (COM7/SEG32 to COM4/SEG35) (At SEG selected)(2) VL2 NOTES: 1.1/8 duty selected by duty ratio selection bits 2.Static, 1/2 duty, 1/3 duty and 1/4 duty selected by duty ratio selection bits When the user wants to set the output level while LCD is turned off to VL3 in a system that uses the COM/SEG shared pin as the SEG pin, set to 1/8 duty. * Examples when LCD is turned off : To set to turn on LCD after driving the RESET pin “H”, and in stop mode Example to use when LCD is turned off : duty ratio selection bits = At 1/4 duty, when executing the STP instruction LDM #%10000011, $0013 ; LCD turned off : LCD enable bit = 02 LDM #%10000111, $0013 ; 1/8 duty : duty ratio selection bits = 1112 STP (After exiting stop mode) LDM #%10000011, $0013 ; 1/4 duty : duty ratio selection bits = 0112 LDM #%10010011, $0013 ; LCD turned on : LCD enable bit = 12 Set duty ratio to be used again before setting to turn on LCD. (c)2005.Renesas Technology Corp., All rights reserved. Page 1 of 1.