Casio 130CR Service Manual page 12

5-1-2. Block Diagram
TO0/P30
16-bit timer/
TI00/P00
event counter
TI01/P01
TO1/P31
8-bit timer/
event counter 1
TI1/P33
TO2/P32
8-bit timer/
event counter 2
TI2/P34
Watchdog timer
Watch timer
SI0/SB0/P25
SO0/SB1/P26 Serial interface 0
SCK0/P27
SI1/P20
SO1/P21
SCK1/P22 Serial interface 1
STB/TxD1/P23
BUSY/RxD1/P24
BUSY/RxD1/P24
STB/TxD1/P23
Serial interface 2
SI2/RxD0/P70
SO2/TxD0/P71
SCK2/ASCK/P72
ANI0/P10 to
ANI7/P17
AV A/D converter
SS
AV
REF0
ANO0/P130,
ANO1/P131
AV
SS
D/A converter
AV
REF1
INTP0/P00 to
Interrupt control
INTP5/P05
BUZ/P36 Buzzer output
PCL/P35 Clock output control
ROM
78K/0
(flash
CPU core
memory)
RAM
V , V , IC
DD0 SS0
V V (V )
DD1 SS1 PP
— 10 —
P00
Port 0 P01 to P05
P07
Port 1 P10 to P17
Port 2 P20 to P27
Port 3 P30 to P37
Port 4 P40 to P47
Port 5 P50 to P57
Port 6 P60 to P67
Port 7 P70 to P72
Port 12 P120 to P127
Port 13 P130, P131
RTP0/P120 to
Real-time output port
RTP7/P127
AD0/P40 to
AD7/P47
A8/P50 to
A15/P57
External access
RD/P64
WR/P65
WAIT/P66
ASTB/P67
RESET
X1
System control X2
XT1/P07
XT2