NEC PD78078 用户手册

This is an 8-bit input/output port with output latches.  Input mode/output mode can be specified  in 1-bit units with

the port mode register 12 (PM12).  When pins P120 to P127 are used as input port pins, an on-chip pull-up resistor

can be connected in 8-bit units with a pull-up resistor option register H (PUOH).

These pins are dual function pin and serve as real-time outputs.

RESET input sets the input mode.

The port 12 block diagram is shown in Figure 6-22.

PUO :  Pull-up resistor option register

PM

:  Port mode register

RD

:  Port 12 read signal

WR :  Port 12 write signal

P-ch

WR

PM

WR

PORT

RD

WR

PUO

V

DD

Selector

PUO12

Output Latch
(P120 to P127)

PM120 to PM127

Internal bus

P120/RTP0 to
P127/RTP7