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7.10 Port A
7.10.1 Overview
Port A is an 8-bit input/output port that is also used for output (TP
timing pattern controller (TPC), input and output (TIOCB
TIOCA
, TCLKD, TCLKC, TCLKB, TCLKA) by the 16-bit integrated timer unit (ITU), and
0
address output (A
to A
23
Pins in port A can drive one TTL load and a 30-pF capacitive load. They can also drive a
Darlington transistor pair. Port A has Schmitt-trigger inputs.
Port A pins
PA /TP /TIOCB /A
7
PA /TP /TIOCA /A
6
PA /TP /TIOCB /A
5
PA /TP /TIOCA /A
4
Port A
PA /TP /TIOCB /TCLKD
3
PA /TP /TIOCA /TCLKC
2
PA /TP /TCLKB
1
PA /TP /TCLKA
0
Mode 3
A
(output)
20
PA
(input/output)/TP (output)/TIOCA (input/output) /A
6
PA
(input/output)/TP (output)/TIOCB (input/output) /A
5
PA
(input/output)/TP (output)/TIOCA (input/output) /A
4
PA
(input/output)/TP (output)/TIOCB (input/output)/TCLKD (input)
3
PA
(input/output)/TP (output)/TIOCA (input/output)/TCLKC (input)
2
PA
(input/output)/TP (output)/TCLKB (input)
1
PA
(input/output)/TP (output)/TCLKA (input)
0
166
). Figure 7-22 shows the pin configuration of port A.
20
7
2
20
6
2
21
5
1
22
4
1
23
3
0
2
0
1
0
6
5
4
3
2
1
0
Figure 7-22 Port A Pin Configuration
, TIOCA
2
Modes 1, 5 and 7
PA
(input/output)/TP (output)/TIOCB (input/output)
7
7
PA
(input/output)/TP (output)/TIOCA (input/output)
6
6
PA
(input/output)/TP (output)/TIOCB (input/output)
5
5
PA
(input/output)/TP (output)/TIOCA (input/output)
4
4
PA
(input/output)/TP (output)/TIOCB (input/output)/TCLKD (input)
3
3
PA
(input/output)/TP (output)/TIOCA (input/output)/TCLKC (input)
2
2
PA
(input/output)/TP (output)/TCLKB (input)
1
1
PA
(input/output)/TP (output)/TCLKA (input)
0
0
(output)
2
21
(output)
1
22
(output)
1
23
0
0
to TP
) from the programmable
7
0
, TIOCB
, TIOCA
2
1
2
2
1
1
0
0
, TIOCB
,
1
0
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