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7.6
Port 9
7.6.1
Overview
Port 9 is a 6-bit input/output port that is also used for input and output (TxD
0
, TxD
1
, RxD
0
, RxD
1
,
SCK
0
, SCK
1
) by serial communication interface channels 0 and 1 (SCI0 and SCI1), and for
IRQ
5
and
IRQ
4
input. See table 7.10 for the selection of pin functions.
The
IRQ
5
and
IRQ
4
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 7.5 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
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
Port 9 pins
1
0
(input/output)/IRQ (input)
(input/output)/IRQ (input)
5
4
1
0
1
0
Figure 7.5 Port 9 Pin Configuration
7.6.2
Register Descriptions
Table 7.9 summarizes the registers of port 9.
Table 7.9
Port 9 Registers
Address*
Name
Abbreviation
R/W
Initial Value
H'EE008
Port 9 data direction register
P9DDR
W
H'C0
H'FFFD8
Port 9 data register
P9DR
R/W
H'C0
Note: * Lower 20 bits of the address in advanced mode.
Summary of Contents for H8/3008
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