CHAPTER 5 PORT FUNCTIONS
User’s Manual U13045EJ2V0UM00
74
Table 5-1. Port Functions
Pin Name
Input/Output
Function
After Reset
Alternate Function
P00 to P03
Input/output
Port 0
Input
—
4-bit I/O port
Input/output can be specified in 1-bit units
When used as 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 I/O port
Input/output can be specified in 1-bit units
When used as 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
ASCK20/SCK20
P21
6-bit I/O port
TxD20/SO20
P22
Input/output can be specified in 1-bit units
RxD20/SI20
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-ch open-drain I/O port
Input/output can be specified in 1-bit units
An on-chip pull-up resistor can be specified for mask
ROM versions by the mask option.
P60 to 63
Input
Port 6
Input
ANI0 to ANI3
4-bit input-only port
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