Rev. 1.0, 09/01, page 460 of 904
10.10
Port B
Port B is an 8-bit I/O port that also has other functions. The port B has the following registers.
•
Port B data direction register (PBDDR)
•
Port B data register (PBDR)
•
Port B register (PORTB)
•
Port B MOS pull-up control register (PBPCR)
10.10.1
Port B Data Direction Register (PBDDR)
The individual bits of PBDDR specify input or output for the pins of port B.
PBDDR cannot be read; if it is, an undefined value will be read.
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
•
Modes 1, 2, 5, and 6
Port B pins are address outputs regardless of the
PBDDR settings.
•
Modes 4 and 7 (when EXPE = 1)
Setting a PBDDR bit to 1 makes the corresponding
port B pin an address output, while clearing the bit to
0 makes the pin an input port.
•
Modes 7 (when EXPE = 0)
Port B is an I/O port, and its pin functions can be
switched with PBDDR.
Содержание H8S/2376 F-ZTAT
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