參數(shù)資料
型號： AV80C51T-12R
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP44
文件頁數(shù)： 155/170頁
文件大小： 4133K
代理商： AV80C51T-12R
85
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
When initiating a single ended conversion by setting the ADSC bit in ADCSRA, the conversion starts at the follow-
ing rising edge of the ADC clock cycle.
A normal conversion takes 13 ADC clock cycles, as summarised in Table 13-1 on page 86. The first conversion
after the ADC is switched on (ADEN in ADCSRA is set) takes 25 ADC clock cycles in order to initialize the analog
circuitry. See Figure 13-4.
Figure 13-4. ADC Timing Diagram, First Conversion (Single Conversion Mode)
The actual sample-and-hold takes place 3 ADC clock cycles after the start of a normal conversion and 16 ADC
clock cycles after the start of a first conversion. See Figure 13-5. When a conversion is complete, the result is writ-
ten to the ADC Data Registers, and ADIF is set. In Single Conversion mode, ADSC is cleared simultaneously. The
software may then set ADSC again, and a new conversion will be initiated on the first rising ADC clock edge.
Figure 13-5. ADC Timing Diagram, Single Conversion
When Auto Triggering is used, the prescaler is reset when the trigger event occurs. See Figure 13-6. This assures
a fixed delay from the trigger event to the start of conversion. In this mode, the sample-and-hold takes place two
ADC clock cycles after the rising edge on the trigger source signal. Three additional CPU clock cycles are used for
synchronization logic.
Conversion Result
ADC Clock
ADSC
Sample & Hold
ADIF
ADCL
Cycle Number
ADEN
1
212
13
14
15
16
17
18
19
20
21
22
23
24
25
1
2
First Conversion
Next
Conversion
3
MUX
Update
MUX
Update
Conversion
Complete
1
2
3
4
5
6
7
8
9
10
11
12
13
Conversion Result
ADC Clock
ADSC
ADIF
ADCL
Cycle Number
12
One Conversion
Next Conversion
3
Sample & Hold
MUX
Update
Conversion
Complete
MUX
Update
相關(guān)PDF資料
PDF描述
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