Page 5
Circuit D escrip tion
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
I
2
C 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 I
2
C-con trolle d fu n ction s
Th e follo win g fu n ction al c on trols are effec ted by I
2
C.
(1) Con t rol o f EEPROM I304 for p arame ter setti n g .
