Datasheet

Rev. 3.00, 03/04, page 232 of 830
8.11 Port B
Port B is an 8-bit multi-function input/output port that can also be used event counter input pin.
Port B has the following registers.
• Port B data direction register (PBDDR)
• Port B output data register (PBODR)
• Port B input data register (PBPIN)
8.11.1 Port B Data Direction Register (PBDDR)
PBDDR is used to specify the input/output attribute of each pin of port B.
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
The corresponding port B pins are output ports when
the PBDDR bits are set to 1, and input ports when
cleared to 0.
8.11.2 Port B Output Data Register (PBODR)
PBODR stores output data for the port B pins.
Bit Bit Name Initial Value R/W Description
7 PB7ODR 0 R/W
6 PB6ODR 0 R/W
5 PB5ODR 0 R/W
4 PB4ODR 0 R/W
3 PB3ODR 0 R/W
2 PB2ODR 0 R/W
1 PB1ODR 0 R/W
0 PB0ODR 0 R/W
The PBODR register stores the output data for the
pins that are used a general output port.