HD6413003RF Datasheet, PDF (255/715 Pages) Renesas Technology Corp – Microcontroller (MCU)

Section 9 I/O Ports
9.1 Overview
The H8/3003 has eight input/output ports (ports 4, 5, 6, 8, 9, A, B, and C) 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 their DDR and DR, ports 4 and 5 have an input pull-up
control register (PCR) for switching input pull-up transistors on and off.
Ports 4, 5, 6, 8, and C 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 to 6 and 8 to C can drive a Darlington
pair. Ports 5 and B can drive LEDs (with 10-mA current sink). Ports 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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