Yamaha Disklavier Silent Mark III Service Manual page 35

M62320FP (XU402A00)
CONTROLLER: IC023
I/O Expand
CS0 CS1 CS2
16 15 14
SCL
2
I 2 C BUS Interface
SDA 3
Output Data
8
Output Data Direction
Latch Resistor
Reset
8
V
13
DD
Power On
Reset
I/O Port
GND 8
12 11 10
D7 D6 D5
YH-S1 (XK413A00)
PWB: IC1
Regulator (Half Bridge)
9 8
10
Starting
Driver1
Circuit1
11
4
Starting
Driver2
Circuit2
5
3 2 1
NC
Shift Resistor SO
1
Input/Output
8 8
Input Data
Latch
8
8 Input Data
9 7 6 5 4
D4 D3 D2 D1 D0
13
Power
SW.TR1
14
16
17
19
Power
SW.TR2
20
NC
SUB 21
Empty Pin:
6 7 12 15 18
, , , ,
PIN NO.
1
SO 16 CS0
2
15
SCL CS1
3
14
SDA CS2
4 13
D0 V
DD
5 12
D1 D7
6
11
D2 D6
7
D3 10 D5
GND 8 9 D4
1
NAME I/O FUNCTION
1 SO O Serial data output
2 SCL I Serial clock input
3 SDA I/O Serial data input/output
4 D0 I/O
5 D1 I/O
Parallel data input/output
6 D2 I/O
7 D3 I/O
8 GND Ground
9 D4 I/O
10 D5 I/O
Parallel data input/output
11 D6 I/O
12 D7 I/O
13 V Power supply +5V
DD
14 CS2 I
15 CS1 I Chip select
16 CS0 I
21
DU1A
35