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AT43USB326 датащи(PDF) 42 Page - ATMEL Corporation

номер детали AT43USB326
подробное описание детали  Multimedia USB Keyboard Controller with Embedded Hub
PDF  102 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT43USB326 датащи(HTML) 42 Page - ATMEL Corporation

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42
AT43USB326
3313D–USB–04/06
Port B
Port B is an 8-bit bi-directional I/O port with open drain outputs and controlled slew rate. It is
designed for use as the column driver in a keyboard controller. The Port B output buffers can
sink or source 4 mA.
Three I/O memory address locations are allocated for the Port B, one each for the Data Regis-
ter - PORTB, $18($38), Data Direction Register (DDRB), $17($37) and the Port B Input Pins
(PINB), $16($36). The Port B Input Pins address is read only, while the Data Register and the
Data Direction Register are read/write.
Port B Data Register – PORTB
Port B Data Direction Register – DDRB
Port B Input Pins Address – PINB
The Port B Input Pins address (PINB) is not a register, and this address enables access to the
physical value on each Port B pin. When reading PORTB, the Port B Data Latch is read, and
when reading PINB, the logical values present on the pins are read.
Bit
7
6
5
4
3
2
1
0
$18 ($38)
PORTB7
PORTB6
PORTB5
PORTB4
PORTB3
PORTB2
PORTB1
PORTB0
PORTB
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Bit
7
6
5
4
3
2
1
0
$17 ($37)
DDB7
DDB6
DDB5
DDB4
DDB3
DDB2
DDB1
DDB0
DDRB
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Bit
7
6
5
4
3
2
1
0
$16 ($36)
PINB7
PINB6
PINB5
PINB4
PINB3
PINB2
PINB1
PINB0
PINB
Read/Write
R
R
R
R
R
R
R
R
Initial Value
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A



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