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H8/3028F Datasheet(PDF) 277 Page - Renesas Technology Corp |
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H8/3028F Datasheet(HTML) 277 Page - Renesas Technology Corp |
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277 / 923 page  Rev. 2.00, 09/03, page 247 of 890 Section 8 I/O Ports 8.1 Overview The H8/3028 Group has 11 input/output ports (ports 1, 2, 3, 4, 5, 6, 7, 8, 9, A, and B). Table 8.1 summarizes the port functions. The pins in each port are multiplexed as shown in table 8.1. 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, 4, and 5 have an input pull-up control register (PCR) for switching input pull-up transistors on and off. Ports 1 to 6 and port 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 6 and 8 to B can drive a darlington pair. Ports 1, 2, and 5 can drive LEDs (with 10-mA current sink). Pins P82 to P80, PA7 to PA0 have Schmitt-trigger input circuits. For block diagrams of the ports see appendix C, I/O Port Block Diagrams. |
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