HD6432138SW datasheet(243/1061 Pages) RENESAS

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Section 8 I/O Ports

Rev. 4.00 Jun 06, 2006 page 189 of 1004

REJ09B0301-0400

Section 8 I/O Ports

8.1

Overview

The H8S/2138 Group and H8S/2134 Group have eight I/O ports (ports 1 to 6, 8, and 9), and one

input-only port (port 7).

Tables 8.1 and 8.2 summarize the port functions. The pins of each port also have other functions.

Each port includes a data direction register (DDR) that controls input/output (not provided for the

input-only port) and data registers (DR, ODR) that store output data.

Ports 1 to 3, and 6 have an on-chip MOS input pull-up function. Ports 1 to 3 and 6 have a MOS

input pull-up control register (PCR), in addition to DDR and DR, to control the on/off status of the

MOS input pull-ups.

Ports 1 to 6, 8, and 9 can drive a single TTL load and 30 pF capacitive load. All the I/O ports can

drive a Darlington transistor when in output mode. Ports 1, 2, and 3 can drive an LED (10 mA

sink current).

In the H8S/2138 Group, P52 in port 5 and P97 in port 9 are NMOS push-pull outputs.

Note that the H8S/2134 Group has subset specifications that do not include some supporting

modules. For differences in pin functions, see table 8.1, H8S/2138 Group Port Functions, and table

8.2, H8S/2134 Group Port Functions.

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