Section 8 I/O Ports
Rev. 1.00 Mar. 12, 2008 Page 246 of 1178
REJ09B0403-0100
8.1.11 Port
B
Port B is an 8-bit I/O port. Port B pins can also function as the bidirectional data bus, de-bounced
input, and EtherC control I/O pins. The pin functions change according to the operating mode.
Port B has the following registers.
•
Port B data direction register (PBDDR)
•
Port B output data register (PBODR)
•
Port B input data register (PBPIN)
•
Noise canceler enable register (P4BNCE)
•
Noise canceler mode control register (P4BNCMC)
•
Noise cancel cycle setting register (NCCS)
(1)
Port B Data Direction Register (PBDDR)
The individual bits of PBDDR specify input or output for the pins 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
When set to 1, the corresponding pins function as
output port pins; when cleared to 0, function as input
port pins.
Содержание H8S Family
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Страница 632: ...Section 17 Synchronous Serial Communication Unit SSU Rev 1 00 Mar 12 2008 Page 584 of 1178 REJ09B0403 0100...
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