P30 To P33 (Port 3); P60 To P63 (Port 6); P70 To P73 (Port 7) - NEC 78K0 User Manual

2.2.4 P30 to P33 (port 3)

P30 to P33 function as a 4-bit I/O port. These pins also function as pins for external interrupt request input and
timer I/O.
The following operation modes can be specified in 1-bit units.
(1) Port mode
P30 to P33 function as a 4-bit I/O port. P30 to P33 can be set to input or output in 1-bit units using port mode
register 3 (PM3). Use of an on-chip pull-up resistor can be specified by pull-up resistor option register 3 (PU3).
(2) Control mode
P30 to P33 function as external interrupt request input pins and timer I/O pins.
(a) INTP1 to INTP4
These are the external interrupt request input pins for which the valid edge (rising edge, falling edge, or both
rising and falling edges) can be specified.
(b) TI51
This is an external count clock input pin to 8-bit timer/event counter 51.
(c) TO51
This is a timer output pin.

2.2.5 P60 to P63 (port 6)

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).
P60 to P63 are N-ch open-drain pins. Use of an on-chip pull-up resistor can be specified by a mask option only for
mask ROM versions.

2.2.6 P70 to P73 (port 7)

P70 to P73 function as a 4-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 P73 function as a 4-bit I/O port. P70 to P73 can be set to input or output 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 P73 function as key interrupt input pins.
CHAPTER 2 PIN FUNCTIONS
User's Manual U16227EJ2V0UD
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