HD64F3437TF16 Datasheet, PDF (150/752 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.

7.5 Port 4
7.5.1 Overview
Port 4 is an 8-bit input/output port that is multiplexed with input/output pins (TMRI₀, TMRI₁,
TMCI₀, TMCI₁, TMO₀, TMO₁) of 8-bit timers 0 and 1 and output pins (PW₀, PW₁) of PWM timers
0 and 1. In slave mode, P4₃ to P4₅ output host interrupt requests. Pins not used by timers or for
host interrupt requests are available for general input/output.
Figure 7.12 shows the pin configuration of port 4.
Pins in port 4 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor.
Port 4
Port 4 pins
P4₇/PW₁
P4₆/PW₀
P4₅/TMRI₁/HIRQ₁₂
P4₄/TMO₁/HIRQ₁
P4₃/TMCI₁/HIRQ₁₁
P4₂/TMRI₀
P4₁/TMO₀
P4₀/TMCI₀
Pin configuration in modes 1 to 3
Master mode
P4₇ (input/output)/PW₁ (output)
P4₆ (input/output)/PW₀ (output)
P4₅ (input/output)/TMRI₁ (input)
P4₄ (input/output)/TMO₁ (output)
P4₃ (input/output)/TMCI₁ (input)
P4₂ (input/output)/TMRI₀ (input)
P4₁ (input/output)/TMO₀ (output)
P4₀ (input/output)/TMCI₀ (input)
Slave mode
P4₇ (input/output)/PW₁ (output)
P4₆ (input/output)/PW₀ (output)
HIRQ₁₂ (output)/TMRI₁ (input)
HIRQ₁ (output)/TMO₁ (output)
HIRQ₁₁ (output)/TMCI₁ (input)
P4₂ (input/output)/TMRI₀ (input)
P4₁ (input/output)/TMO₀ (output)
P4₀ (input/output)/TMCI₀ (input)
Figure 7.12 Port 4 Pin Configuration
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