HD6433644R datasheet(189/549 Pages) RENESAS

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Section 8 I/O Ports

Rev. 6.00 Sep 12, 2006 page 169 of 526

REJ09B0326-0600

Section 8 I/O Ports

8.1

Overview

The H8/3644 Group is provided with three 8-bit I/O ports, three 5-bit I/O ports, two 3-bit I/O

ports, and one 8-bit input-only port. Table 8.1 indicates the functions of each port.

Each port has of a port control register (PCR) that controls input and output, and a port data

See section 2.9.2, Notes on Bit Manipulation, for information on executing bit-manipulation

instructions to write data in PCR or PDR.

Block diagrams of each port are given in appendix C, I/O Port Block Diagrams.

Table 8.1

Port Functions

Port

Description

Pins

Other Functions

Function Switching

Port 1

• 5-bit I/O port

• Input pull-up

MOS selectable

P17/IRQ3/TRGV

P16 to P15/

IRQ2 to IRQ1

External interrupt 3, timer

V trigger input

External interrupts 2 and 1

PMR1

P14/PWM

14-bit PWM output

PMR1

P10/TMOW

Timer A clock output

PMR1

Port 2

• 3-bit I/O port

P22/TxD

SCI3 data output

PMR7

P21/RxD

SCI3 data input

SCR3

P20/SCK1

SCI3 clock input/output

SCR3, SMR

Port 3

• 3-bit I/O port

• Input pull-up

MOS selectable

P32/SO1

P31/SI1

P30/SCK1

SCI1 data output (SO1),

data input (SI1), clock

input/output (SCK1)

PMR3

Port 5

• 8-bit I/O port

P57 /INT7

INT interrupt 7

• Input pull-up

MOS

P56 /INT6/

TMIB

INT interrupt 6

Timer B1 event input

P55/INT5/

ADTRG

INT interrupt 5

A/D converter external

trigger input

P54 to P50/

INT4 to INT0

INT interrupts 4 to 0

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