Micom(Micro Computer) Pb Ass'y - Panasonic BT-M1950Y Service Manual

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MICOM(MICRO COMPUTER) PB ASS'Y
The MICOM PB ASS'Y uses an MB89647 MPU IC with 12C (Inter-IC) bus for controlling the video and deflection systems.
The user interface functions are controlled from the front control PB ASS'Y.
1. MPU IC (MICRO COMPUTER)
The MPU uses a Fujitsu MB89647. The specifications are indicated below.
• ROM: 32 K
• RAM:.1 K
• Ports: 65
• Package: QFP 80 pin
• Clock: 8 MHz
• AID converter: 8 channels (5 channels used)
(bright, contrast, color, tint, volume)
• PWM (pulse width modulation): 2 channels (1 channel used, audio control)
• PWC (pulse width count): 1 channel (remote controller optical receiver)
• 8 bit serial: 2 channels
• DIA converter: 2 channels (not used)
1-1 Pin functions
Pin No.
Signal name
(- is negative logic)
1 SWIN3
2 SWIN2
3 SWIN1
4 SWIN0
5 -V SYNC
6 EXT INPUT SEL
7 -H SYNC
8
EXT CONT EN
9 NC
10 NC
11 D.GND
12 D.GND
13
XO
14 Xl
15 D.GND
16 -RST
17 NC
18 NC
19 NC
20
SCAN4
21 SCAN3
22
SCAN2
23 SCAN1
Signal functions
Front control switch data line
Front control switch data line
Front control switch data line
Front control switch data line
Vertical sync signal
External control input selection
Horizontal sync signal
External control enable
Not connected (grounded)
Not connected
Digital ground
Digital ground
Clock oscillator (8 MHz)
Clock oscillator (8 MHz)
Digital ground
Reset terminal
Not connected
Not connected
Not connected
Front control switch scan line
Front control switch scan line
Front control switch scan line
Front control switch scan line
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