UPD78F9418A NEC, UPD78F9418A Datasheet - Page 80

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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4.2.4 Port 5
units by using port mode register 5 (PM5). For a mask ROM version, whether a pull-up resistor is to be incorporated
can be specified by a mask option.
80
This is a 4-bit N-ch open-drain I/O port with an output latch. Port 5 can be specified as input or output in 1-bit
Port 5 is set to input mode when the RESET signal is input.
Figure 4-10 shows a block diagram of port 5.
PM:
RD:
WR:
WR
WR
RD
PORT
PM
Port mode register
Port 5 read signal
Port 5 write signal
(P50 to P53)
Output latch
PM50 to PM53
Figure 4-10. Block Diagram of P50 to P53
CHAPTER 4 PORT FUNCTIONS
User’s Manual U13952EJ3V0UD
N-ch
V
DD0
Mask option resistor
Mask ROM version only.
For the flash memory version,
a pull-up resistor is not
incorporated.
P50 to P53