Mcu - Mitsubishi DPLUS 74SB -BKA Service Manual

2. MCU

Monitor MCU Specification
Frequency Specification
H-freq. : 29.5K – 70kHz
V-freq. : 43 – 160Hz
Judge polarity only when horizontal frequency is 31.5 kHz and 37.8 kHz
Support composite sync detection
System Architecture
1. MCU – Weltrend WT6260, 60K bytes ROM size
2. EEPROM – 24C08 series, 8K bit, with ID code for identify initialization.
3. OSD – Myson MTV030N-46
Input
1. Sync input – 2 pins for H-sync & V-sync frequency inverted input.
2. Key input – 2 pins for A/D key input (SELECT. UP, DOWN and RECALL).
3. Burn-in ID input – 1 pins for Burn-in ID input.
4. Reset input – low pulse for reset MCU
5. Crystal input – 2 pins using 8MHz crystal.
Output – MCU digital pin
1. Degauss – Active high pulse for 2.5 sec when in degauss. MCU will activate degauss while power on.
2. CS output – 3 pins (CS2, CS1, CS0) for CS control
H-sync
H-sync < 33.25kHz
33.25kHz < H-sync < 36.50kHz
36.50kHz < H-sync < 40.50kHz
40.50kHz < H-sync < 45.10kHz
45.10kHz < H-sync < 51.60kHz
51.60kHz < H-sync < 55.10kHz
55.10kHz < H-sync < 62.15kHz
62.15kHz < H-sync
Mode change
CS2 CS1
0 0
0 1
0 1
1 0
1 0
1 1
1 1
1 1
0 0
7-5
CS0
0
0
1
0
1
0
0
1
0