HD6432351 datasheet(401/1025 Pages) RENESAS

401 / 1025 page

Section 9 I/O Ports

Rev. 3.00 Sep 15, 2006 page 367 of 988

REJ09B0330-0300

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.

PA7/A23/IRQ7

PA6/A22/IRQ6

PA5/A21/IRQ5

PA4/A20/IRQ4

PA3/A19

PA2/A18

PA1/A17

PA0/A16

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)

Port A pins

Pin functions in modes 4 and 5*

Pin functions in mode 6*

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 1 to 3 and 7*

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)

Port A

Note: * Modes 2, 3, 6, and 7 only apply to the H8S/2351.

Figure 9.7 Port A Pin Functions

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