HD6413007F20 Datasheet, PDF (275/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 8 I/O Ports
8. I/O Ports
8.1 Overview
The H8/3006 and H8/3007 have 6 input/output ports (ports 4, 6, 8, 9, A, and B) and one input-only
port (port 7). 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, port 4 has an input pull-up MOS
control register (PCR) for switching input pull-up transistors on and off.
Ports 4, 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 4, 6 and 8 to B can drive a darlington transistor
pair. 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.5.00 Sep. 12, 2007 Page 245 of 764
REJ09B0396-0500