UPD789304 Datasheet, PDF (10/64 Pages) NEC – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD789304, 789306, 789314, 789316
3. PIN FUNCTIONS
3.1 Port Pins
Pin Name
P00 to P03
I/O
I/O
P10 to P13 I/O
P20
I/O
P21
P22
P23
P24
P25
P26
P30
I/O
P31
P32
P33
P50 to P53 I/O
Function
After Reset Alternate 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 in port units by software.
Input
KR0 to KR3
Port 1.
Input
–
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 in port units by software.
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 in 1-bit units by software.
Input
SCK10
SO10
SI10
SCK20/ASCK20
SO20/TxD20
SI20/RxD20
TO20
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 in 1-bit units by software.
Input
INTP0/CPT20
INTP1/TO30/TMI40
INTP2/TO40
INTP3
Port 5.
Input
–
4-bit I/O port.
Input/output can be specified in 1-bit units.
An on-chip pull-up resistor can be specified in bit units by the
mask option.
10
Data Sheet U14384EJ1V0DS