HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 285

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

9.10 Port 9
9.10.1 Overview
Port 9 is a 6-bit input/output port that is also used for input and output (TxD
SCK
and IRQ
The IRQ
for input or output. For details see section 5, Interrupt Controller.
Port 9 has the same set of pin functions in all operating modes. Figure 9-9 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.
9.10.2 Register Descriptions
Table 9-16 summarizes the registers of port 9.
Table 9-16 Port 9 Registers
Address*
H'FFD0
H'FFD2
Note: * Lower 16 bits of the address.
0
, SCK
4
5
input. See table 9-17 for the selection of pin functions.
and IRQ
1
) by serial communication interface channels 0 and 1 (SCI0 and SCI1), and for IRQ
Name
Port 9 data direction register
Port 9 data register
Port 9
4
functions are selected by IER settings, regardless of whether the pin is used
Figure 9-9 Port 9 Pin Configuration
Port 9 pins
P9 (input/output)/SCK
P9 (input/output)/SCK
P9 (input/output)/RxD (input)
P9 (input/output)/RxD (input)
P9 (input/output)/TxD (output)
P9 (input/output)/TxD (output)
5
4
3
2
1
0
272
Abbreviation
P9DDR
P9DR
1
0
1
0
1
0
(input/output)/IRQ (input)
(input/output)/IRQ (input)
R/W
W
R/W
0
, TxD
5
4
1
Initial Value
H'C0
H'C0
, RxD
0
, RxD
5
1
,