參數(shù)資料
型號： AT43USB320A-AC
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Full-speed USB Microcontroller with an Embedded Hub
中文描述： 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP100
封裝： 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, MS-026AED, LQFP-100
文件頁數(shù)： 68/115頁
文件大小： 722K
代理商： AT43USB320A-AC
68
AT43USB320A
1443E–USB–4/04
Port D
Port D is an 8-bit bi-directional I/O port. Its output buffers can sink or source 2 mA.
Three I/O memory address locations are allocated for the Port D, one each for the Data Regis-
ter - PORTD, $12($32), Data Direction Register (DDRD), $11($31) and the Port D Input Pins
(PIND), $10($30). The Port D Input Pins’ address is read only, while the Data Register and the
Data Direction Register are read/write.
The port pins have no selectable pull-up resistors.
Some Port D pins have alternate functions as shown in Table 27.
When the pins are used for the alternate function the DDRD and PORTD register has to be set
according to the alternate function description.
Port D Data Register – PORTD
Port D Data Direction Register – DDRD
Port D Input Pins Address – PIND
The Port D Input Pins address (PIND) is not a register, and this address enables access to the
physical value on each Port D pin. When reading PORTD, the Port D Data Latch is read, and
when reading PIND, the logical values present on the pins are read.
Table 27.
Port D Alternate Functions
Port Pin
Alternate Function
PD0
RXD (UART Input Line)
PD1
TXD (UART Output Line)
PD2
INT0, External Interrupt 0
PD3
INT1, External Interrupt 1
PD5
OC1A Timer/Counter1 Output Compare A
Bit
7
6
5
4
3
2
1
0
$12 ($32)
PORTD7
PORTD6
PORTD5
PORTD4
PORTD3
PORTD2
PORTD1
PORTD0
PORTD
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
$11 ($31)
DDD7
DDD6
DDD5
DDD4
DDD3
DDD2
DDD1
DDD0
DDRD
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
$10 ($30)
PIND7
PIND6
PIND5
PIND4
PIND3
PIND2
PIND1
PIND0
PIND
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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