Overview; Register Descriptions - Hitachi F-ZTAT H8/3039 Series Hardware Manual

7.9 Port 9

7.9.1 Overview

Port 9 is a 6-bit input/output port that is also used for input and output (TxD
) by serial communication interface channels 0 and 1 (SCI0 and SCI1), and for IRQ
SCK , SCK
0 1
and IRQ
input.
4
Port 9 has the same set of pin functions in all operating modes. Figure 7-21 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

7.9.2 Register Descriptions

Table 7-13 summarizes the registers of port 9.
Table 7-13 Port 9 Registers
*
Address Name
H'FFD0 Port 9 data direction register
H'FFD2 Port 9 data register
Note: * Lower 16 bits of the address.
162
Port 9 pins
P9 (input/output)/SCK
5
P9 (input/output)/SCK
4
P9 (input/output)/RxD (input)
3
P9 (input/output)/RxD (input)
2
P9 (input/output)/TxD (output)
1
P9 (input/output)/TxD (output)
0
Figure 7-21 Port 9 Pin Configuration
(input/output)/IRQ (input)
1
(input/output)/IRQ (input)
0
1
0
1
0
Abbreviation
P9DDR
P9DR
, TxD , RxD , RxD
0 1 0
5
4
R/W Initial Value
W H'C0
R/W H'C0
,
1
5