Yamaha NX-A01 Service Manual page 9

IC501: µPD789022GB-A70-8ES-A (MAIN (2) P.C.B.)
Microprocessor
TI0/TO0/P50
event/counter 00
TO2/P51
CPT2/INPUT2/P32
SCK0/ASCK/P20
SO0/TxD/P21
SI0/RxD/P22
INTP0/P30-INTP2/
CTP2/P32
KR0/P40-KR7/P47
P12
P11
P10
P47/KR7
P46/KR6
P45/KR5
P44/KR4
P43/KR3
P42/KR2
P41/KR1
P40/KR0
8-bit timer
16-bit timer 20
78K/0S
CPU core
Watchdog timer
Serial
RAM
Interface 00
256 bytes
Interrupt
V
control
V
44 43 42 41 40 39
1
2
3
4
5
6
7
8
9
10
11
12 13 14 15 16 17
ROM
4 KB
V
DD0 SS0
IC
V
DD1 SS1
38 37 36 35 34
33
32
31
30
29
28
27
26
25
24
23
18 19 20 21 22
NX-A01
Port 0
P00 to P07
Port 1
P10 to P17
Port 2
P20 to P22
Port 3
P30 to P32
Port 4
P40 to P47
Port 5
P50 to P53
RESET
System
X1
control
X2
P03
P04
P05
P06
P07
P20/ASCK/SCK0
P21/TxD/SO0
P22/RxD/SI0
P30/INTP0
P31/INTP1
P32/INTP2/CPT2
9