UPD78F9418AGK-9EU Renesas Electronics America, UPD78F9418AGK-9EU Datasheet - Page 85

• Manufacturer Part Number: UPD78F9418AGK-9EU
• Manufacturer: Renesas Electronics America

Specifications of UPD78F9418AGK-9EU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.2.6 Port 8
mode register 8 (PM8). When using the P80 to P87 pins as input port pins, internal pull-up resistors can be connected
in 2-bit units by using pull-up resistor option register 2 (PU2).
This is an 8-bit I/O port with an output latch. Port 8 can be specified as input or output in 1-bit units by using port
Port 8 is also used to output segment signals for the LCD controller/driver.
Port 8 is set to input mode when the RESET signal is input.
Figure 4-13 shows a block diagram of port 8.
PU2:
PM:
RD:
WR:
LPS0:
n = 0, 2, 4, 6, m = 0 to 7
WR
WR
WR
WR
RD
PORT
PU2
LPS
PM
Pull-up resistor option register 2
Port mode register
Port 8 read signal
Port 8 write signal
LCD port selector 0
Segment output
Output latch
PU28n
PM8m
(P8m)
LPS0
Figure 4-13. Block Diagram of P80 to P87
CHAPTER 4 PORT FUNCTIONS
User’s Manual U13952EJ3V1UD
V
DD0
P-ch
P80/S27 to P87/S20
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