NEC uPD78P078 - Manual (Page 153)

153
CHAPTER 6 PORT FUNCTIONS
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
6.2.12 Port 10
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.
Figure 6-20. Block Diagram of P100 and P101
PUO : Pull-up resistor option register
PM : Port mode register
RD : Port 10 read signal
WR : Port 10 write signal