HD64F3039F18 Datasheet, PDF (157/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 7 I/O Ports
Section 7 I/O Ports
7.1 Overview
The H8/3039 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 10-mA current sink). Pins
P8₁, P8₀, PA₇ to PA₀, and PB₃ to PB₀ have Schmitt-trigger input circuits.
For block diagrams of the ports see appendix C, I/O Block Diagrams.
Rev.3.00 Mar. 26, 2007 Page 133 of 682
REJ09B0353-0300