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

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 153 Page - 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
P8
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.



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