HD6413003RF Datasheet, PDF (258/715 Pages) Renesas Technology Corp – Microcontroller (MCU)

9.2 Port 4
9.2.1 Overview
Port 4 is an 8-bit input/output port with the pin configuration shown in figure 9-1. The pin
functions differ between the 8-bit and 16-bit bus modes.
When the bus width control register (ABWCR) designates areas 0 to 7 all as 8-bit-access areas,
the H8/3003 operates in 8-bit bus mode and port 4 is a generic input/output port. When at least
one of areas 0 to 7 is designated as a 16-bit-access area, the H8/3003 operates in 16-bit bus mode
and port 4 becomes the lower data bus.
Port 4 has software-programmable built-in pull-up transistors.
Pins in port 4 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor pair.
Port 4
Port 4 pins 8-bit bus mode ^*1
P4₇ /D₇
P4₆ /D₆
P4₅ /D₅
P4₄ /D₄
P4₃ /D₃
P4₂ /D₂
P4₁ /D₁
P4₀ /D₀
P4₇ (input/output)
P4₆ (input/output)
P4₅ (input/output)
P4₄ (input/output)
P4₃ (input/output)
P4₂ (input/output)
P4₁ (input/output)
P4₀ (input/output)
16-bit bus mode ^*2
D₇ (input/output)
D₆ (input/output)
D₅ (input/output)
D₄ (input/output)
D₃ (input/output)
D₂ (input/output)
D₁ (input/output)
D₀ (input/output)
Notes: 1. Initial state in modes 1 and 3.
2. Initial state in modes 2 and 4.
Figure 9-1 Port 4 Pin Configuration
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