7-1
CIRCUIT DESCRIPTION
TABLE OF CONTENTS
Page
1. Power Supply --------------------------------------------------------------------------------------- 7-2
2. Video Input Circuit --------------------------------------------------------------------------------- 7-2
3. Definition Converter LSI Peripheral Circuit -------------------------------------------------- 7-2
4. System Reset, LED Control Circuit ------------------------------------------------------------ 7-2
4.1
System
Reset ------------------------------------------------------------------------------------- 7-2
4.2 LED Control Circuit ------------------------------------------------------------------------------ 7-2
5.
E
2
PROM for PnP ----------------------------------------------------------------------------------- 7-3
6.
E
2
PROM --------------------------------------------------------------------------------------------- 7-3
7. CPU Circuit ------------------------------------------------------------------------------------------ 7-3
7.1 Detection of POWER Switch Status --------------------------------------------------------- 7-3
7.2 Display Mode Identification -------------------------------------------------------------------- 7-3
7.3
User
Control
---------------------------------------------------------------------------------------
7-5
7.4 Control of Definition Converter gm5020 (I315) -------------------------------------------- 7-5
7.5
I
2
C Bus Control ----------------------------------------------------------------------------------- 7-5
7.6 Power ON Sequence ---------------------------------------------------------------------------- 7-6
7.7 Power OFF Sequence -------------------------------------------------------------------------- 7-6
7.8 List of CPU Pin Assignments ------------------------------------------------------------------ 7-7