3069RF-ZTAT Datasheet, PDF (307/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

8.10 Port 9
8.10.1 Overview
Port 9 is a 6-bit input/output port that is also used for input and output (TxD₀, TxD₁, RxD₀, RxD₁,
SCK₀, SCK₁) by serial communication interface channels 0 and 1 (SCI0 and SCI1), and for IRQ₅
and IRQ₄ input. See table 8.17 for the selection of pin functions.
The IRQ₅ and IRQ₄ functions are selected by IER settings, regardless of whether the pin is used
for input or output. Caution is therefore required. For details see section 5.3.1, External Interrupts.
Port 9 has the same set of pin functions in all operating modes. Figure 8.9 shows the pin
configuration of port 9.
Pins in port 9 can drive one TTL load and a 30-pF capacitive load. They can also drive a
darlington transistor pair.
Port 9
Port 9 pins
P9₅ (input/output)/SCK₁ (input/output)/IRQ₅ (input)
P9₄ (input/output)/SCK₀ (input/output)/IRQ₄ (input)
P9₃ (input/output)/RxD₁ (input)
P9₂ (input/output)/RxD₀ (input)
P9₁ (input/output)/TxD₁ (output)
P9₀ (input/output)/TxD₀ (output)
Figure 8.9 Port 9 Pin Configuration
Rev. 5.0, 09/04, page 285 of 978