H838024 datasheet(235/697 Pages) RENESAS

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Section 8 I/O Ports

Rev. 7.00 Mar 10, 2005 page 193 of 652

REJ09B0042-0700

Section 8 I/O Ports

8.1

Overview

The LSI is provided with five 8-bit I/O ports, two 4-bit I/O ports, one 3-bit I/O port, one 8-bit

input-only port, one 1-bit input-only port, and one 6-bit output-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.

Ports 5, 6, 7, 8, and A are also used as liquid crystal display segment and common pins, selectable

in 4-bit units.

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

Registers

Port 1

P17/

IRQ

3/TMIF

External interrupt 3, timer

event input pin TMIF

PMR1

TCRF

P16*

None

P14/

IRQ

ADTRG External interrupt 4, A/D

converter external trigger

PMR1

AMR

• 4-bit I/O port

• MOS input pull-up

option

P13/TMIG

Timer G input capture

PMR1

PMR2

Port 3

P37/AEVL

P36/AEVH

Asynchronous counter event

input pins AEVL, AEVH

PMR3

ECCR

P35 to P33

None

PMR2

P32, TMOFH

P31, TMOFL

Timer F output compare

output

PMR3

• 8-bit I/O port

• MOS input pull-up

option

• Large-current

port*

• MOS open drain

output selectable

(only P35)

P30/UD

Timer C count up/down

selection input

PMR3

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