Acer AL702 AL702 Monitor Service Guide - Page 6

A L502 9.3.2 Fu n ction s Con trol is effected for th e pu sh -switch es to be u sed wh en th e u ser ch an g es th e parameters, in order to modify th e respecti v e settin g v alu e s. Wh eth er th e s witch h as been p ressed is iden ti fied with th e switch in pu t lev el th at is tu rn ed "L". Each switch in pu t port is pu lled u p at ou tside of ASIC. Each para meter is stored i n th e EEPROM, th e con ten ts of wh ic h are u pdated as requ ired. 9.4 Con t rol of defin i tion co n v erter LSI I300. 9.4.1 Ports related to con trol Pin No. I/O Signal name Function 159 I IRQ interrupt signal 5 I/O SCL serial clock 6 I/O SDA serial data 9.4.2 Fu n ction s Majo r fu n cti on of I300 are as foll ows: (1) Expan sion of th e displa y screen . (2) Timi n g con trol for v ariou s sig n a l ty pes. (3) Power-su pp ly sequ en c e (LCD pa n el). 9.5 I2C bu s con trol 9.5.1 Re lated ports of I303 Port Pin No. I/O Signal name Function P1.7 14 O SCL IIC bus clock P1.6 13 I/O SDA IIC bus data 9.5.2 I2C-con trolle d fu n ction s Th e follo win g fu n ction al c on trols are effec ted by I2C. (1) Con t rol o f EEPROM I304 for p arame ter setti n g . CircuitD escrip tion Page 5