| ’QY4 MCU |
Pin number |
PVCC Usage |
| IRQ |
9 |
Video horizontal sync
(start of video scan line) |
| PTA3 |
8 |
Interface DS1820 1-Wire
bus temperature sensor |
| OSC1 |
4 |
32-MHz External oscillator
input for OSD Active mode |
| PTA4 |
5 |
Change enable output
|
| AD1 |
12 |
Analog input to measure
battery voltage |
| PTA0 |
13 |
Communications with
user’s PC during Configuration mode |
|
CdS photocell light
sensor input (AD0) during Charge mode |
| PTB0 |
15 |
Video vertical sync
detection (start of new video frame) |
| PTB1 |
14 |
Output to enable/disable
external oscillator |
| PTB2 |
11 |
Auxiliary loads to
on/off control output |
| PTB3 |
10 |
Configuration mode
request jumper |
| PTB4–6 |
7, 6, 3 |
LED status indicator
outputs |
| PTB7 |
2 |
Overlay text output
signal (added to video signal) |