HD64F3437TF16 Datasheet, PDF (155/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

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 transistor.
Port 5
Port 5 pins
P5₂ (input/output)/SCK₀ (input/output)
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
Port 5 data direction register
Port 5 data register
Abbreviation
P5DDR
P5DR
Read/Write
W
R/W
Initial Value
H'F8
H'F8
Address
H'FFB8
H'FFBA
126