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Table 7-1 Port Functions (cont)
Port
Description
Port 9
• 6-bit I/O
port
Port A • 8-bit I/O
port
• Schmitt
inputs
Pins
Mode 1
/ I RQ
P9
/ SCK
,
Input and output (SCK
5
1
5
/ I RQ
P9
/ SCK
,
for serial communication interfaces 1 and 0 (SCI0, 1),
4
0
4
IRQ
P9
/RxD
,
3
1
P9
/RxD
,
2
0
P9
/TxD
,
1
1
P9
/TxD
0
0
PA
/TP
/
Output (TP
7
7
TIOCB
/A
from pro-
2
20
grammable
timing pattern
controller
(TPC), input or
output
(TIOCB
16-bit
integrated
timer unit
(ITU), and
generic input/
output
PA
/TP
/
TPC output
6
6
TIOCA
/A
,
(TP
2
21
PA
/TP
/
ITU input and
5
5
TIOCB
/A
,
output
1
22
PA
/TP
/
(TIOCA
4
4
TIOCA
/A
TIOCB
1
23
TIOCA
generic input/
output
PA
/TP
/
TPC output (TP
3
3
TIOCB
/TCLKD,
TCLKC, TCLKB, TCLKA, TIOCB
0
PA
/TP
/
input/output
2
2
TIOCA
/TCLKC,
0
PA
/TP
/
1
1
TCLKB,
PA
/TP
/
0
0
TCLKA
Mode 3
, SCK
1
and IRQ
input, and 6-bit generic input/output
5
4
)
Address
7
output (A
) for
2
TPC output
to TP
),
(TP
to TP
6
4
6
ITU input and
output
,
(TIOCA
2
,
TIOCB
1
1
), and
TIOCA
1
1
address
output
(A
to A
23
and generic
input/output
to TP
), ITU input and output (TCLKD,
3
0
Mode 5 Mode 6 Mode 7
, RxD
, RxD
, TxD
0
1
0
TPC output (TP
)
input or output (TIOCB
20
and generic input/output
TPC output (TP
),
ITU input and output
4
(TIOCA
, TIOCB
2
TIOCA
), and generic
1
,
input/output
2
,
),
),
21
, TIOCA
), and generic
0
0
, TxD
)
1
0
), ITU
7
),
2
to TP
),
6
4
,
1
133
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