HD64F3048VTF8 Datasheet, PDF (287/903 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip

Section 9 I/O Ports
Section 9 I/O Ports
9.1 Overview
The H8/3048B Group has 10 input/output ports (ports 1, 2, 3, 4, 5, 6, 8, 9, A, and B) and one input
port (port 7). Table 9.1 summarizes the port functions. The pins in each port are multiplexed as
shown in table 9.1.
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
MOS control register (PCR) for switching input pull-up MOS 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, 5, and B can drive LEDs (with 10-mA current sink). Pins P8₂ to 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.
Rev. 3.00 Sep 27, 2006 page 259 of 872
REJ09B0325-0300