Casio 130CR Service Manual page 13

5-1-3. Pin Function
(1) Port pins (1/2)
Pin Name I/O
P00 Input Port 0
P01 I/O 7-bit I/O port
P02
P03
P04
P05
Note 1
P07 Input
P10 to P17 I/O Port 1
8-bit I/O port
Input/output can be specified in 1-bit units.
If used as an input port, an on-chip pull-up resistor can
be connected by setting software.
P20 I/O Port 2
P21 8-bit I/O port
P22 Input/output can be specified in 1-bit units.
P23 If used as an input port, an on-chip pull-up resistor can
P24 be connected by setting software.
P25
P26
P27
P30 I/O Port 3
P31 8-bit I/O port
P32 Input/output can be specified in 1-it units.
P33 If used as an input port, an on-chip pull-up resistor can
P34 be connected by setting software.
P35
P36
P37
Notes
1. When the P07/XT1 pin is used as an input port, set bit 6 (FRC) of the processor clock control register
(PCC) to 1 (do not use the feedback resistor incorporated in the subsystem clock oscillator).
2. When pins P10/ANI0 to P17/ANI7 are used as an analog input of the A/D converter, set port 1 to the
input mode. In this case, any connected on-chip pull-up resistors are automatically disabled.
Function
Input only
Input/output can be specified in 1-bit
units.
If used as an input port, an on-chip
pull-up resistor can be connected by
setting software.
Input only
Note 2
— 11 —
After Reset Alternate Function
Input INTP0/TI00
Input INTP1/TI01
INTP2
INTP3
INTP4
INTP5
Input XT1
Input ANI0 to ANI7
Input SI1
SO1
SCK1
STB/TxD1
BUSY/RxD1
SI0/SB0
SO0/SB1
SCK0
Input TO0
TO1
TO2
TI1
TI2
PCL
BUZ
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