HD6413002 Datasheet, PDF (253/700 Pages) Renesas Technology Corp – High-performance single-chip microcontroller

Section 9 I/O Ports
9.1 Overview
The H8/3002 has six input/output ports (ports 4, 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, port 4 has an input pull-up 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 pair.
Port 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.
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