Block Diagram Of P120 To P127 - NEC PD78076 User Manual

6.2.13 Port 12
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.
WR
PUO
RD
WR
PORT
Output Latch
(P120 to P127)
WR
PM
PM120 to PM127
PUO : Pull-up resistor option register
PM : Port mode register
RD : Port 12 read signal
WR : Port 12 write signal
CHAPTER 6 PORT FUNCTIONS
Figure 6-22. Block Diagram of P120 to P127
PUO12
Selector
V
DD
P-ch
P120/RTP0 to
P127/RTP7
155