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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)： | 67/115頁 |
| 文件大小： | 722K |
| 代理商： | AT43USB320A-AC |
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67
AT43USB320A
1443E–USB–4/04
Port C
Port C is an 8-bit bi-directional I/O port with push-pull outputs. The Port C 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 Pins 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.
Port C as General
Digital I/O
All 8 pins in Port C have equal functionality when used as digital I/O pins.
PCn, General I/O pin: The DDCn bit in the DDRC register selects the direction of this pin, if
DDCn is set (one), PCn is configured as an output pin. If DDCn is cleared (zero), PCn is con-
figured as an input pin. The value of PORTCn has no meaning in this mode. The Port C pins
are tri-stated when a reset condition becomes active, even if the clock is not active.
Note:
n: 7…0, pin number
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
Table 26.
DDCn Effects on Port C Pins
DDCn
PORTCn
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
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