P60 To P67 (Port 6); P70 To P77 (Port 7); P120 (Port 12); P130 (Port 13) - NEC 78K0 User Manual

2.2.7

P60 to P67 (port 6)

P60 to P67 function as an 8-bit I/O port. These pins also function as control pins in external memory expansion
mode.
The following operation modes can be specified.
(1) Port mode
P60 to P67 function as an 8-bit I/O port. P60 to P67 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.
Use of an on-chip pull-up resistor can be specified for P64 to P67 by pull-up resistor option register 6 (PU6).
(2) Control mode
P64 to P67 function as control signal output pins (RD, WR, WAIT, ASTB) in external memory expansion mode.
Cautions 1. P66 functions as an I/O port if the external wait is not used in external memory expansion
mode.
2. The external bus interface function cannot be used in (A1) grade products and (A2) grade
products.
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 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.
2.2.9

P120 (port 12)

P120 functions as a 1-bit I/O port. This pin also functions as a pin for external interrupt request input.
The following operation modes can be specified.
(1) Port mode
P120 functions as a 1-bit I/O port. P120 can be set to input or output using port mode register 12 (PM12). Use of
an on-chip pull-up resistor can be specified by pull-up resistor option register 12 (PU12).
(2) Control mode
P120 functions as an external interrupt request input pin (INTP0) for which the valid edge (rising edge, falling
edge, or both rising and falling edges) can be specified.

2.2.10 P130 (port 13)

P130 functions as a 1-bit output-only port.
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CHAPTER 2 PIN FUNCTIONS
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User's Manual U15947EJ2V0UD