UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 93

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.2.5 Port 4
mode register 4 (PM4). When using port 4, internal pull-up resistors can be connected in 1-bit units by using pull-
up resistor option register 4 (PU4).
This is an 8-bit I/O port with output latches. Port 4 can be set in the input or output mode in 1-bit units via port
Alternate functions include an address/data bus function that is used in the external memory expansion mode.
RESET input sets port 4 to input mode.
Figure 4-6 shows the block diagram of port 4.
PU: Pull-up resistor option register
PM: Port mode register
RD: Read signal of port 4
WR: Write signal of port 4
WR
WR
WR
RD
PORT
PU
PM
PM40 to PM47
PU40 to PU47
Output latch
(P40 to P47)
Figure 4-6. Block Diagram of P40 to P47
CHAPTER 4 PORT FUNCTIONS
User’s Manual U13029EJ7V1UD
Selector
V
DD
P-ch
P40/AD0 to
P47/AD7
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