參數(shù)資料
型號(hào)： AT43USB325E-AU
廠商： ATMEL CORP
元件分類(lèi)： 微控制器/微處理器
英文描述： Multimedia USB Keyboard Controller with Embedded Hub
中文描述： 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP64
封裝： 1.40 MM HEIGHT, GREEN, PLASTIC, MS-026ACB, LQFP-64
文件頁(yè)數(shù)： 60/109頁(yè)
文件大?。?/td> 643K
代理商： AT43USB325E-AU
60
3355C–USB–4/05
AT43USB325
7.4.4
Port D as General Digital I/O
PDn, General I/O Pin:
The DDDn bit in the DDRD register selects the direction of this pin. If
DDDn is set (one), PDn is con-figured as an output pin. If DDDn is cleared (zero), PDn is config-
ured as an input pin. The value of PORTDn has no meaning in this mode. The Port D pins are
tri-stated when a reset condition becomes active.
Note:
n: 7,6,5,4,3,1,0, pin number
7.4.5
Alternate Functions of Port D
INT1, External Interrupt Source 1:
The PD3 pin can serve as an external interrupt source to
the MCU. See the interrupt description for further details, and how to enable the source.
7.5
Port E
Port E[0:3] each is a bi-directional I/O port with open drain outputs and controlled slew rate and
is designed for use as the column drivers in a keyboard controller. The Port E[0:3] output buffers
can sink 4 mA. Port E[4:7] are bi-directional I/O with outputs capable of driving LEDs directly.
Each pin of Port E[4:7] has a series resistor to limit the LEDs current.
Three I/O memory address locations are allocated for the Port E, one each for the Data Register
- PORTE, $03($23), Data Direction Register - DDRE, $02($22) and the Port E Input Pins - PINE,
$01($21). The Port E Input Pins address is read only, while the Data Register and the Data
Direction Register are read/write.
7.5.1
Port E Data Register – PORTE
7.5.2
Port E Data Direction Register – DDRE
Table 7-3.
DDDn Bits on Port D Pins
DDDn
PORTDn
I/O
Comment
0
0
Input
Tri-state (Hi-Z)
0
1
Input
Tri-state (Hi-Z)
1
0
Output
Push-pull Zero Output
1
1
Output
Push-pull One Output
Bit
7
6
5
4
3
2
1
0
$03($23)
PORTE7
PORTE6
PORTE5
PORTE4
PORTE3
PORTE2
PORTE1
PORTE0
PORTE
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
$02 ($22)
DDE7
DDE6
DDE5
DDE4
DDE3
DDE2
DDE1
DDE0
DDRE
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
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