Mcu; System Architecture - NEC MultiSync FE700 Serviceanleitung

2. MCU

Monitor MCU Specification for Model FE700 (N9705)
Frequency Specification
H-freq. : 29.5K – 71KHz
V-freq. : 43 – 160Hz
Judge polarity only when frequency is 31.5 KHz and 37.8 KHz
Support composite sync detection

System Architecture

1.
MCU – Weltrend WT6132, 32K bytes ROM size
2.
EEPROM – 24C04 series, 4K bit, with ID code for identify initialization.
3.
OSD – Myson MTV021N20
Input
1.
Sync input – 2 pins for H-sync & V-sync frequency inverted input.
2.
Key input – 2 pins for A/D key input (EXIT, -, +, DOWN, UP, PROCEED and RESET).
3.
Reset input – low pulse for reset MCU
4.
Crystal input – 2 pins using 12MHz crystal.
Output – MCU digital pin
1.
Degauss – Active high pulse for 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
fH =< 33.8KHz
33.8KHz< fH =<36.5KHz
36.5KHz< fH =<42.6KHz
42.6KHz< fH =<44.3KHz
44.3KHz< fH =<51.2KHz
51.2KHz< fH =<62.0KHz
62.0KHz< fH =<71.0KHz
71.0KHz< fH
Mode change
CS2 CS1
0 0
0 0
0 1
1 0
1 0
1 1
1 1
0 0
0 0
8 - 5
CS0
0
1
1
0
1
0
1
0
0