AXIOMTEK CAPA13S Series, Руководство пользователя

Страница: 69 / 69

CAPA13S Capa Board
Digital I/O 63
Register 3: Configuration register.
This register configures the directions of the I/O pins. If a bit in this register is set, the
corresponding port pin is enabled as an input with high-impedance output driver. If a bit in this
register is cleared, the corresponding port pin is enabled as an output. At reset, the I/Os are
configured as inputs with a weak pull-up to V
DD
.
Register 3 – Configuration register bit description
Bit Symbol Access Default Value Description
7 C7 R/W 1
Configures the directions of the I/O pins.
0 = Corresponding port pin enabled as an output.
1 = Corresponding port pin configured as input
(default value).
6 C6 R/W 1
5 C5 R/W 1
4 C4 R/W 1
3 C3 R/W 1
2 C2 R/W 1
1 C1 R/W 1
0 C0 R/W 1