H8SLASH3021 datasheet(153/712 Pages) RENESAS

No. de pieza	H8/3021

Descripción Electrónicos	16-Bit Single-Chip Microcomputer

PDF	712 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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7. I/O Ports

Rev.2.00 Mar. 22, 2007 Page 129 of 684

REJ09B0352-0200

Section 7 I/O Ports

7.1

Overview

The H8/3022 Group has nine input/output ports (ports 1, 2, 3, 5, 6, 8, 9, A, and B) and one input

port (port 7). Table 7.1 summarizes the port functions. The pins in each port are multiplexed as

shown in table 7.1.

Each port has a data direction register (DDR) for selecting input or output, and a data register

(DR) for storing output data. In addition to these registers, ports 2, and 5 have an input pull-up

control register (PCR) for switching input pull-up transistors on and off.

Ports 1 to 3 and ports 5, 6, and 8 can drive one TTL load and a 90-pF capacitive load. Ports 9, A,

and B can drive one TTL load and a 30-pF capacitive load. Ports 1 to 3 and ports 5, 6, 8, 9, A, and

B can drive a Darlington pair. Ports 1, 2, 5, and B can drive LEDs (with 5-mA current sink). Pins

1, P80, PA7 to PA0, and PB3 to PB0 have Schmitt-trigger input circuits.

For block diagrams of the ports see appendix C, I/O Port Block Diagrams.

H8/3021 Datasheet(PDF) 153 Page - Renesas Technology Corp