Control Of Identification Converter Lsi (Ic306) - HP VF15 Service Manual

10.3.1Related ports of I303
Port Pin No.
GPIO21 47
GPIO3 43
GPIO7 47
GPIO6 46
10.3.2Functions
Control is effected for the push-switches to be used when the user changes the parameters, in order to modify the
respective setting values. 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 I303.
Each parameter is stored in the EEPROM, the contents of which are updated as required.
10.4 Control of definition converter gm 2115 (I303).
10.4.1Ports related to control
Pin No. I/O
51 I/O
52
207 I/O
208 I/O
10.4.2Functions
Major function of I303 are as follows:
(1) Expansion of the display screen.
(2) Timing control for various signal types.
(3) Power-supply sequence (LCD panel).
Page 8
I/O Signal name
I Power
I MANUAL
I Down
I Up
Signal name
SDA Gm2115 serial data
O SCL Gm2115 serial clock
HDATA2 Gm2115 Address input
HDATA1 Gm2115 Address input
vf15 / FP15 / f1523 / FP5315
Function
Menu Switch input
- switch input
+ switch input
Function
Remarks
Power Switch Key
MENU key
Down / AUTO key
Up / BRI key