User’s Manual U13045EJ2V0UM00
39
CHAPTER 3 PIN FUNCTIONS
3.1 Pin Function List
(1) Port pins
Pin Name
Input/Output
Function
After Reset
Alternate Function
P00 to P03
Input/output
Port 0
Input
—
4-bit input/output port
Input/output can be specified in 1-bit units
When used as an input port, an on-chip pull-up
resistor can be specified by means of pull-up resistor
option register 0 (PU0).
P10, P11
Input/output
Port 1
Input
—
2-bit input/output port
Input/output can be specified in 1-bit units
When used as an input port, an on-chip pull-up
resistor can be specified by means of pull-up resistor
option register 0 (PU0).
P20
Input/output
Port 2
Input
SCK20/ASCK20
P21
6-bit input/output port
SO20/TxD20
P22
Input/output can be specified in 1-bit units
SI20/RxD20
P23
An on-chip pull-up resistor can be specified by means
INTP0/CPT20/SS20
P24
of pull-up resistor option register B2 (PUB2)
INTP1/TO80/TO20
P25
INTP2/TI80
P50 to P53
Input/output
Port 5
Input
—
4-bit N-channel open-drain input/output port
Input/output can be specified in 1-bit units
For a mask ROM version, an on-chip pull-up resistor
can be specified by the mask option.
P60 to P63
Input
Port 6
Input
ANI0 to ANI3
4-bit input port
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