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9.10 Port 9
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9.10.1 Overview
Port 9 is a 6-bit input/output port that is also used for input and output (TxD
SCK
, SCK
) by serial communication interface channels 0 and 1 (SCI0 and SCI1), and for IRQ
0
1
and IRQ
input. See table 9-17 for the selection of pin functions.
4
The IRQ
and IRQ
functions are selected by IER settings, regardless of whether the pin is used
5
4
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.
Port 9
9.10.2 Register Descriptions
Table 9-16 summarizes the registers of port 9.
Table 9-16 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.
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 9-9 Port 9 Pin Configuration
272
, TxD
0
(input/output)/IRQ (input)
1
5
(input/output)/IRQ (input)
0
4
1
0
1
0
Abbreviation
R/W
P9DDR
W
P9DR
R/W
, RxD
, RxD
,
1
0
1
5
Initial Value
H'C0
H'C0
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