UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 94

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

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.2.6 Port 5
mode register 5 (PM5). When using port 5, internal pull-up resistors can be connected in 1-bit units by using pull-
up resistor option register 5 (PU5).
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This is an 8-bit I/O port with output latches. Port 5 can be set in the input or output mode in 1-bit units via port
Port 5 can directly drive LEDs.
Alternate functions include serial interface clock and data I/O, timer I/O, and external interrupt request input.
RESET input sets port 5 to input mode.
Figures 4-7 and 4-8 show the block diagram of port 5.
Cautions 1. When performing transmission using the serial interface or timer output, set the pins to be
PU: Pull-up resistor option register
PM: Port mode register
RD: Read signal of port 5
WR: Write signal of port 5
2. Because pins P54 to P57 are also used as external interrupt request input pins, an interrupt
WR
WR
WR
RD
used to output mode, and set the output latch to 0.
request flag is set when the port is set in the output mode and its output level is changed.
When using the output mode, therefore, set the interrupt mask flag to 1.
PORT
When performing reception or timer input, set the pins to be used to input mode.
PU
PM
Output latch
PM50
(P50)
PU50
Figure 4-7. Block Diagram of P50
CHAPTER 4 PORT FUNCTIONS
User’s Manual U13029EJ7V1UD
Selector
V
DD
P-ch
P50