Chapter 2 Pin Functions; Pin Function List - NEC 78K0S/KA1+ User Manual

2.1 Pin Function List

(1) Port functions
Pin Name I/O
P20 to P23 I/O
P30 I/O
P31
Note
P34 Input
P40 I/O
P41
P42
P43
P44
P45
Note
P121 I/O
Note
P122
P123
P130 Output
Note For the setting method for pin functions, see CHAPTER 17 OPTION BYTE.
Caution The P121/X1 and P122/X2 pins are pulled down during reset.

CHAPTER 2 PIN FUNCTIONS

Function
Port 2.
4-bit I/O port.
Can be set to input or output mode in 1-bit units.
An on-chip pull-up resistor can be connected by setting software.
Port 3 Can be set to input or output mode in 1-
bit units.
An on-chip pull-up resistor can be
connected by setting software.
Input only
Port 4.
6-bit I/O port.
Can be set to input or output mode in 1-bit units.
An on-chip pull-up resistor can be connected by setting software.
Port 12.
3-bit I/O port.
Can be set to input or output mode in 1-bit units.
An on-chip pull-up resistor can be connected only to P123 by
setting software.
Port 13.
1-bit output-only port
User's Manual U16898EJ3V0UD
After Reset Alternate-
Function Pin
Input ANI0 to ANI3
Input TI000/INTP0
TI010/TO00/
INTP2
Note
Input RESET
−
Input
INTP3
TOH1
TxD6/INTP1
RxD6
−
Note
Input X1
Note
X2
−
−
Output
21