UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 91

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

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.2.3 Port 2
register 2 (PM2). When using port 2, internal pull-up resistors can be connected in 1-bit units by using pull-up resistor
option register 2 (PU2).
This is a 7-bit I/O port with output latches. Port 2 can be set in the input or output mode in 1-bit units via port mode
Alternate functions include serial interface data I/O and timer I/O.
RESET input sets port 2 to input mode.
Figure 4-4 shows the block diagram of port 2.
Caution When performing transmission using the serial interface or timer output, set the pins to be used
WR
PU: Pull-up resistor option register
PM: Port mode register
RD: Read signal of port 2
WR: Write signal of port 2
WR
WR
RD
PORT
PU
PM
to output mode, and set the output latch to 0.
When performing reception or timer input, set the pins to be used to input mode.
PM20 to PM26
PU20 to PU26
(P20 to P26)
Output latch
Alternate
function
Figure 4-4. Block Diagram of P20 to P26
CHAPTER 4 PORT FUNCTIONS
User’s Manual U13029EJ7V1UD
Selector
V
DD
P-ch
P20/RxD00,
P21/TxD00,
P22/RxD01,
P23/TxD01,
P24/TI50/TO50,
P25/TI51/TO51,
P26/TI52/TO52
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