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10.8
Port B
10.8.1
Overview
Port B is an 8-bit I/O port. Port B pins also function as TPU I/O pins (TIOCA3, TIOCB3,
TIOCC3, TIOCD3, TIOCA4, TIOCB4, TIOCA5, TIOCB5) and as address outputs; the pin
functions change according to the operating mode.
Port B has a built-in MOS input pull-up function that can be controlled by software.
Figure 10-9 shows the port B pin configuration.
Port B
Port B pins
PB7 / A15/TIOCB5
PB6 / A14/TIOCA5
PB5 / A13/TIOCB4
PB4 / A12/TIOCA4
PB3 / A11/TIOCD3
PB2 / A10/TIOCC3
PB1 / A9 /TIOCB3
PB0 / A8 /TIOCA3
Figure 10-9 Port B Pin Functions
Pin functions in modes 4 to 6
PB7
(I/O) /
A15
(output) / TIOCB5 (I/O)
PB6
(I/O) /
A14
(output) / TIOCA5 (I/O)
PB5
(I/O) /
A13
(output) / TIOCB4 (I/O)
PB4
(I/O) /
A12
(output) / TIOCA4 (I/O)
PB3
(I/O) /
A11
(output) / TIOCD3 (I/O)
PB2
(I/O) /
A10
(output) / TIOCC3 (I/O)
PB1
(I/O) /
A9
(output) / TIOCB3 (I/O)
PB0
(I/O) /
A8
(output) / TIOCA3 (I/O)
Pin functions in mode 7
PB7
(I/O) / TIOCB5 (I/O)
PB6
(I/O) / TIOCA5 (I/O)
PB5
(I/O) / TIOCB4 (I/O)
PB4
(I/O) / TIOCA4 (I/O)
PB3
(I/O) / TIOCD3 (I/O)
PB2
(I/O) / TIOCC3 (I/O)
PB1
(I/O) / TIOCB3 (I/O)
PB0
(I/O) / TIOCA3 (I/O)
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