Port 9; Overview; Register Descriptions - Hitachi H8/3032 Series Hardware Manual

7.9 Port 9

7.9.1 Overview

Port 9 is a 3-bit input/output port that is also used for input and output (TxD, RxD, SCK) by serial
communication interface (SCI), and for IRQ
operating modes. Figure 7-18 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.

7.9.2 Register Descriptions

Table 7-13 summarizes the registers of port 9.
Table 7-13 Port 9 Registers
Address*
H'FFD0
H'FFD2
Note: * Lower 16 bits of the address.
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4
Port 9 pins
P9 (input/output)/SCK (input/output)/IRQ
4
Port 9
P9 (input/output)/RxD (input)
2
P9 (input/output)/TxD (output)
0
Figure 7-18 Port 9 Pin Configuration
Name
Port 9 data direction register
Port 9 data register
input. Port 9 has the same set of pin functions in all
Abbreviation R/W
P9DDR W
P9DR R/W
150
(input)
4
Initial Value
H'C0
H'C0