User Control; Control Of Definition Converter Gm5020 (I315); I 2 C Bus Control - NEC MultiSync LCD1700NX A Service Manual

7.3 User Control

7.3.1 Related Ports of I315 and I302 Pin Functions
Port Pin No.
GPI04 I315, M1
GPI05 I315, L1
GPI06 I315, G18
GPI07 I315, G19
GPI0 I302, 15
7.3.2 Functions
The value of each parameter in the OSD can be adjusted by the tact switch. Whether the switch has
been pressed is identified with the switch input level that is turned "L".
Each switch input port is pulled up at outside of I302.
Each parameter is stored in the EEPROM, the contents of which are updated as required.

7.4 Control of Definition Converter gm5020 (I315)

7.4.1 Ports related to control
Pin No. I/O
R3 I
P1 O
P3, P4, I/O
R1, R2
P2 O
7.4.2 Related ports of I315 and I302.
Port Pin No.
P3.5 17
P3.4 16
7.4.3 Functions
Major function of I315 are as follows:
(1) Expansion of the display screen.
(2) Timing control for various signal types.
(3) Power-supply sequence (LCD panel).
2
7.5 I C Bus Control
7.5.1 Related Ports of I302 (as 7.4.2)
2
7.5.2 I C-controlled Functions
The following functional controls are effected by I
(1) Control of EEPROM I305 for parameter setting.
I/O Signal name
I NENU EXIT/ENTER switch input
6 switch input
DOWN
I
−
3 switch input
I
4 switch input
+
I
I POWER Soft power switch input
Signal name
IRQ GmZan1 interrupt signal
HCLK GmZan1 serial clock
HDATA GmZan1 serial data
HFS GmZan1 serial select
I/O Signal name
I IICCLK
I/O IICDATA
Function
Function
Function
IIC bus clock
IIC bus data
2
C.
7-5
Remarks
ENTER/Withdraw from OSD
(6)key
(3)key
(4)key
(power)key