Electronics America Single-Chip Microcontrollers User's Manual

User’s Manual U15331EJ4V1UD 37
CHAPTER 2 PIN FUNCTIONS
2.1 List of Pin Functions
(1) Port pins (1/2)
Pin Name I/O Function After Reset Alternate Function
P00 to P07 I/O Port 0.
8-bit I/O 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 in 1-bit units by pull-up resistor option register B0
(PUB0) or the key return mode register (KRM00).
Input KR0 to KR7
Note 1
KR00 to KR07
Note 2
P10, P11 I/O Port 1.
2-bit I/O 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 in 1-bit units by pull-up resistor option register B1
(PUB1).
Input
−
P20 SCK20/ASCK20
P21 SO20/TxD20
P22 SI20/RxD20
P23 SCK10
P24 SO10
P25
I/O Port 2.
6-bit I/O 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 in 1-bit units by pull-up resistor option register B2
(PUB2).
Input
SI10
P30 INTP0/TO50/TMI60
P31 INTP1/TO60
P32 INTP2/TMI61/TO61
P33 INTP3/CPT20/TO20
P34
I/O Port 3.
5-bit I/O port.
Input/output can be specified in 1-bit units.
When used as an input port, on-chip pull-up resistors can be
specified in 1-bit units by pull-up resistor option register B3
(PUB3).
Input
RIN
Note 2
P50 to P53 I/O Port 5.
4-bit N-ch open-drain I/O port.
Input/output can be specified in 1-bit units.
For mask ROM version, an on-chip pull-up resistor can be
specified by mask option.
Input
−
P60 to P67 Input Port 6.
8-bit input port.
Input ANI0 to ANI7
Note 1
ANI0/KR10 to
ANI7/KR17
Note 2
Notes 1. µ PD789488 and 78F9488 only
2. µ PD789489 and 78F9489 only