Rev. 1.00, 09/03, page 205 of 704
7.12 Port
B
Port B is an 8-bit I/O port. Port B pins also function as TMR1_1 input pins, TMR1_0 output pins,
FRT_1 and timer connection_0 I/O pins, and timer connection_1 input pins.
Port B has the following registers.
•
Port B data direction register (PBDDR)
•
Port B data register (PBDR)
•
Port B register (PORTB)
7.12.1
Port B Data Direction Register (PBDDR)
The individual bits in PBDDR specify input or output for the pins of port B. The read value is
undefined.
Bit
Bit Name
Initial Value
R/W
Description
7 PB7DDR
0
W
6 PB6DDR
0
W
5 PB5DDR
0
W
4 PB4DDR
0
W
3 PB3DDR
0
W
2 PB2DDR
0
W
1 PB1DDR
0
W
0 PB0DDR
0
W
While a general I/O port function is selected, the
corresponding port B pin is an output port when a
PBDDR bit is set to 1, and an input port when
cleared to 0.
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