HD6432351 Datasheet, PDF (376/989 Pages) Renesas Technology Corp – The H8S/2000 CPU has an internal 32-bit architecture, is provided with sixteen 16-bit general registers and a concise

9.8 Port A
9.8.1 Overview
Port A is an 8-bit I/O port. Port A pins also function as address bus outputs and interrupt input
pins (IRQ4 to IRQ7). The pin functions change according to the operating mode.
Port A has a built-in MOS input pull-up function that can be controlled by software (H8S/2351
only). Pins PA₇ to PA₄ are schmitt-triggered inputs.
Figure 9-7 shows the port A pin configuration.
Port A
Port A pins
PA₇/A₂₃/IRQ7
PA₆/A₂₂/IRQ6
PA₅/A₂₁/IRQ5
PA₄/A₂₀/IRQ4
PA₃/A₁₉
PA₂/A₁₈
PA₁/A₁₇
PA₀/A₁₆
Pin functions in modes 1, 2, 3, and 7*
PA₇ (I/O)/IRQ7 (input)
PA₆ (I/O)/IRQ6 (input)
PA₅ (I/O)/IRQ5 (input)
PA₄ (I/O)/IRQ4 (input)
PA₃ (I/O)
PA₂ (I/O)
PA₁ (I/O)
PA₀ (I/O)
Pin functions in modes 4 and 5*
PA₇ (input)/A₂₃(output)/IRQ7 (input)
PA₆ (input)/A₂₂(output)/IRQ6 (input)
PA₅ (input)/A₂₁ (output)/IRQ5 (input)
A₂₀ (output)
A₁₉ (output)
A₁₈ (output)
A₁₇ (output)
A₁₆ (output)
Pin functions in mode 6*
PA₇ (input)/A₂₃ (output)/IRQ7 (input)
PA₆ (input)/A₂₂ (output)/IRQ6 (input)
PA₅ (input)/A₂₁ (output)/IRQ5 (input)
PA₄ (input)/A₂₀ (output)/IRQ4 (input)
PA₃ (input)/A₁₉ (output)
PA₂ (input)/A₁₈ (output)
PA₁ (input)/A₁₇ (output)
PA₀ (input)/A₁₆ (output)
Note: * Modes 2, 3, 6, and 7 only apply to the H8S/2351.
Figure 9-7 Port A Pin Functions
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