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7.8
Port B
7.8.1
Overview
Port B is an 8-bit input/output port that is also used for output (TP
programmable timing pattern controller (TPC), input/output (TMIO
the 8-bit timer, and CS
hardware standby transition leaves port B as an input/output port.
For output of CS
to CS
7
to any of these functions are available for generic input/output. Figure 7.7 shows the pin
configuration of port B.
Pins in port B can drive one TTL load and a 30-pF capacitive load. They can also drive darlington
transistor pair.
Port B
166
to CS
output. See table 7.15 for the selection of pin functions. A reset or
7
4
in modes 1 to 4, see section 6.3.4, Chip Select Signals. Pins not assigned
4
Port B pins
PB
/TP
7
15
PB
/TP
6
14
PB
/TP
5
13
PB
/TP
4
12
PB
/TP
/TMIO
3
11
3
PB
/TP
/TMO
2
10
2
PB
/TP /TMIO
1
9
1
PB
/TP /TMO
/CS
0
8
0
Pin functions in modes 1 to 4
PB
(input/output)/TP
7
PB
(input/output)/TP
6
PB
(input/output)/TP
5
PB
(input/output)/TP
4
PB
(input/output)/TP
3
PB
(input/output)/TP
2
PB
(input/output)/TP
1
PB
(input/output)/TP
0
Figure 7.7 Port B Pin Configuration
/CS
4
/CS
5
/CS
6
7
(output)
15
(output)
14
(output)
13
(output)
12
(output) /TMIO
11
(output) /TMO
10
(output) /TMIO
9
(output) /TMO
8
to TP
) from the
15
8
, TMO
, TMIO
3
2
(input/output) /CS
3
(output) /CS
(output)
2
5
(input/output) /CS
1
(output) /CS
(output)
0
7
, TMO
) by
1
0
(output)
4
(output)
6
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