UPD78F0138 NEC, UPD78F0138 Datasheet - Page 106

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

4.2.6 Port 5
using port mode register 5 (PM5). Use of an on-chip pull-up resistor can be specified in 1-bit units using pull-up
resistor option register 5 (PU5).
106
Port 5 is a 4-bit I/O port with an output latch. Port 5 can be set to the input mode or output mode in 1-bit units
RESET input sets port 5 to input mode.
Figure 4-15 shows a block diagram of port 5.
PU5:
PM5:
RD:
WR××: Write signal
WR
WR
WR
RD
PORT
Pull-up resistor option register 5
Port mode register 5
Read signal
PM
PU
PM50 to PM53
PU50 to PU53
(P50 to P53)
Output latch
PM5
PU5
Figure 4-15. Block Diagram of P50 to P53
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16228EJ2V0UD
Selector
EV
DD
P-ch
P50 to P53