HD64F3028F25 Datasheet, PDF (279/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

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.
Rev. 2.00, 09/03, page 247 of 890