參數(shù)資料
型號(hào): AT43USB326-AU
廠商: Atmel Corp.
英文描述: Multimedia USB Keyboard Controller with Embedded Hub
中文描述: 多媒體USB鍵盤控制器的嵌入式集線器
文件頁(yè)數(shù): 43/102頁(yè)
文件大?。?/td> 511K
代理商: AT43USB326-AU
43
AT43USB326
3313D–USB–04/06
Port C
Port C is an 8-bit bi-directional I/O port with an internal pull-up resistor at each pin. Port C is
designed for use as the row inputs of a keyboard controller. Its output buffers can sink 4 mA.
Three I/O memory address locations are allocated for the Port C, one each for the Data Regis-
ter - PORTC, $15($35), Data Direction Register - DDRC, $14($34) and the Port C Input Pins –
PINC, $13($33). The Port C Input Pin’s address is read only, while the Data Register and the
Data Direction Register are read/write.
Port C Data Register – PORTC
Port C Data Direction Register – DDRC
Port C Input Pins Address – PINC
The Port C Input Pins address (PINC) is not a register, and this address enables access to the
physical value on each Port C pin. When reading PORTC, the Port C Data Latch is read, and
when reading PINC, the logical values present on the pins are read.
Bit
7
6
5
4
3
2
1
0
$15 ($35)
PORTC7
PORTC6
PORTC5
PORTC4
PORTC3
PORTC2
PORTC1
PORTC0
PORTC
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
$14 ($34)
DDC7
DDC6
DDC5
DDC4
DDC3
DDC2
DDC1
DDC0
DDRC
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
$13 ($33)
PINC7
PINC6
PINC5
PINC4
PINC3
PINC2
PINC1
PINC0
PINC
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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