P40 To P43 (Port 4); P50 To P53 (Port 5); P60 To P63 (Port 6); P70 To P77 (Port 7) - NEC 78K0 Series User Manual

2.2.5 P40 to P43 (port 4)

P40 to P43 function as a 4-bit I/O port. P40 to P43 can be set to input or output port in 1-bit units using port mode
register 4 (PM4). Use of an on-chip pull-up resistor can be specified by pull-up resistor option register 4 (PU4).

2.2.6 P50 to P53 (port 5)

P50 to P53 function as a 4-bit I/O port. P50 to P53 can be set to input or output port in 1-bit units using port mode
register 5 (PM5). Use of an on-chip pull-up resistor can be specified by pull-up resistor option register 5 (PU5).

2.2.7 P60 to P63 (port 6)

P60 to P63 function as a 4-bit I/O port. These pins also function as pins for serial interface data I/O, clock I/O, and
external clock input.
The following operation modes can be specified in 1-bit units.
(1) Port mode
P60 to P63 function as a 4-bit I/O port. P60 to P63 can be set to input port or output port in 1-bit units using port
mode register 6 (PM6).
Output of P60 to P63 is N-ch open-drain output (6 V tolerance).
(2) Control mode
P60 to P63 function as serial interface data I/O, clock I/O, and external clock input.
(a) SDA0
This is a serial data I/O pin for serial interface IIC0.
(b) SCL0
This is a serial clock I/O pin for serial interface IIC0.
(c) EXSCL0
This is an external clock input pin to serial interface IIC0. To input an external clock, input a clock of 6.4 MHz.

2.2.8 P70 to P77 (port 7)

P70 to P77 function as an 8-bit I/O port. These pins also function as key interrupt input pins.
The following operation modes can be specified in 1-bit units.
(1) Port mode
P70 to P77 function as an 8-bit I/O port. P70 to P77 can be set to input or output port in 1-bit units using port
mode register 7 (PM7). Use of an on-chip pull-up resistor can be specified by pull-up resistor option register 7
(PU7).
(2) Control mode
P70 to P77 function as key interrupt input pins.
(a) KR0 to KR7
These are the key interrupt input pins
CHAPTER 2 PIN FUNCTIONS
Preliminary User's Manual U17260EJ3V1UD
39