參數(shù)資料
型號: AT43USB351M-AC
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: Full-speed/Low-speed USB Microcontroller with ADC and PWM
中文描述: 8-BIT, MROM, 24 MHz, RISC MICROCONTROLLER, PQFP48
封裝: 7 X 7 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASTIC, MS-026BBC, LQFP-48
文件頁數(shù): 64/101頁
文件大?。?/td> 624K
代理商: AT43USB351M-AC
64
AT43USB351M
3302E–USB–7/04
ADC Data Register – ADCL and ADCH
When an ADC conversion is complete, the result is found in these two registers. In Free Run
Mode, it is essential that both registers are read, and that ADCL is read before ADCH.
Scanning Multiple
Channels
Since change of analog channels is always delayed until a conversion is finished, the Free
Run Mode can be used to scan multiple channels without interrupting the converter. Typically,
the ADC Conversion Complete interrupt will be used to perform the channel shift. However,
the user should take the following fact into consideration:
The interrupt triggers once the result is ready to be read. In Free Run Mode, the next conver-
sion will start immediately when the interrupt triggers. If ADMUX is changed after the interrupt
triggers, the next conversion has already started and the old setting is used.
Table 24.
ADC Prescaler Selections
ADPS2
ADPS1
ADPS0
Division Factor
0
0
0
2
0
0
1
2
0
1
0
4
0
1
1
8
1
0
0
16
1
0
1
32
1
1
0
64
1
1
1
128
Bit
7
6
5
4
3
2
1
0
$03 ($23)
ADC9
ADC8
ADCH
$24 ($44)
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
ADCL
Read/Write
R
R
R
R
R
R
R
R
Initial Value
0
0
0
0
0
0
0
0
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