NEC PD78078 Manuale Utente

P-ch

WR

PM

WR

PORT

RD

WR

PUO

V

DD

Selector

PUO10

Output Latch
(P100, P101)

PM100, PM101

Internal bus

Dual-functions

P100/TI5/TO5,
P101/TI6/TO6

Port 10 is a 4-bit input/output port with output latch.  P100 to P103 pins can specify the input mode/output mode

in 1-bit units with the port mode register 10 (PM10).  When pins P100 to P103 are used as input ports, an on-chip

pull-up resistor can be connected to them in 4-bit units with a pull-up resistor option register H (PUOH).

Dual-functions include the timer input/output.

RESET input sets port 10 to input mode.

Figures 6-20 and 6-21 show block diagrams of port 10.

PUO :  Pull-up resistor option register

PM

:  Port mode register

RD

:  Port 10 read signal

WR :  Port 10 write signal