7.6
Port 5
7.6.1
Overview
Port 5 is a 3-bit input/output port that is multiplexed with input/output pins (TxD0, RxD0, SCK0) of
serial communication interface 0. The port 5 pin functions are the same in all operating modes.
Figure 7.13 shows the pin configuration of port 5.
Pins in port 5 can drive one TTL load and a 30-pF capacitive load. They can also drive a
darlington pair.
Port 5 pins
P52 (input/output)/SCK0 (input/output)
Port 5
P51 (input/output)/RxD0 (input)
P50 (input/output)/TxD0 (output)
Figure 7.13 Port 5 Pin Configuration
7.6.2
Register Configuration and Descriptions
Table 7.10 summarizes the port 5 registers.
Table 7.10 Port 5 Registers
Name
Abbreviation
P5DDR
Read/Write
Initial Value
H'F8
Address
H'FFB8
H'FFBA
Port 5 data direction register
Port 5 data register
W
P5DR
R/W
H'F8
135
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