NEC mPD789426 Series User Manual page 79

Pin Name I/O
P00 to P03 I/O
P10, P11 I/O
P20 I/O
P21
P22
P23
P24
P25
P26
P30 I/O
P31
P32
P33
P50 to P53 I/O
P60 to P65 Input
P70 to P72 I/O
CHAPTER 4 PORT FUNCTIONS
Table 4-1. Port Functions (1/2)
Function
Port 0.
4-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 by means of pull-up resistor option
register 0 (PU0) or key return mode register 00
(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 by pull-up resistor option register 0
(PU0).
Port 2.
7-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 by means of pull-up resistor option
register B2 (PUB2).
Port 3.
4-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 by means of pull-up resistor option
register B3 (PUB3).
Port 5.
4-bit I/O 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 a mask option.
Port 6.
6-bit input port.
Port 7.
3-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 by means of pull-up resistor option
register B7 (PUB7).
User's Manual U15075EJ1V0UM00
After Reset Alternate Function
Input KR0 to KR3
−
Input
−
Input
BZO90
SS20
SCK20/ASCK20
SO20/TxD20
SI20/RxD20
TO90
Input INTP0/CPT90
INTP1/TO50/TMI60
INTP2/TO60
INTP3/TO61
−
Input
Input ANI0 to ANI5
−
Input
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