Chapter 2 Pin Functions; List Of Pin Functions - NEC PD789488 User Manual

Pd789489 subseries 8-bit single-chip microcontrollers
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2.1 List of Pin Functions

(1)
Port pins (1/2)
Pin Name
I/O
P00 to P07
I/O
P10, P11
I/O
P20
I/O
P21
P22
P23
P24
P25
P30
I/O
P31
P32
P33
P34
P50 to P53
I/O
P60 to P67
Input
µ
Notes 1.
PD789488 and 78F9488 only
µ
2.
PD789489 and 78F9489 only

CHAPTER 2 PIN FUNCTIONS

Function
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).
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).
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).
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).
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.
Port 6.
8-bit input port.
User's Manual U15331EJ4V1UD
After Reset
Alternate Function
Note 1
Input
KR0 to KR7
KR00 to KR07
Input
Input
SCK20/ASCK20
SO20/TxD20
SI20/RxD20
SCK10
SO10
SI10
Input
INTP0/TO50/TMI60
INTP1/TO60
INTP2/TMI61/TO61
INTP3/CPT20/TO20
Note 2
RIN
Input
Note 1
Input
ANI0 to ANI7
ANI0/KR10 to
Note 2
ANI7/KR17
Note 2
37

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