3069RF-ZTAT Datasheet, PDF (275/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Section 8 I/O Ports
8.1 Overview
This LSI has ten input/output ports (ports 1 to 6, 8, 9, A, and B) and one input 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, 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. 5.0, 09/04, page 253 of 978