NEC PD754244 Manuel D’Utilisation
24
User’s Manual U10676EJ3V0UM
CHAPTER 2 PIN FUNCTIONS
2.1 Pin Functions of
µPD754244
Table 2-1. Pin Functions of Digital I/O Ports
Pin Name
I/O
Alternate
Function
8-Bit
After Reset
I/O Circuit
Function
I/O
Type
Note 1
P30
I/O
PTO0
×
Input
E-B
P31
PTO1
P32
PTO2
P33
–
P60
I/O
AV
REF
×
Input
F -A
P61
INT0
P62
PTH00
P63
PTH01
P70
Input
KR4
×
Input
B -A
P71
KR5
P72
KR6
P73
KR7
P80
I/O
–
×
Input
F -A
Notes 1.
Circled characters indicate Schmitt-triggered input.
2.
Do not specify connection of an on-chip pull-up resistor when using a programmable threshold port.
Programmable 4-bit I/O port (Port 3).
Input/output can be specified in 1-bit units.
On-chip pull-up resistor can be specified by
software in 4-bit units.
Programmable 4-bit I/O port (Port 6).
Input/output can be specified in 1-bit units.
An on-chip pull-up resistor can be specified
by software in 4-bit units
Note 2
.
A noise eliminator is selectable for P61/
INT0.
4-bit input port (Port 7).
A pull-up resistor can be incorporated (mask
option).
1-bit I/O port (PORT8).
An on-chip pull-up resistor can be specified
by software.