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AT43USB353M 데이터시트(PDF) 53 Page - ATMEL Corporation

부품명 AT43USB353M
상세설명  Low Cost Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
PDF  95 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT43USB353M 데이터시트(HTML) 53 Page - ATMEL Corporation

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AT43USB353M
3307B–USB–4/04
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 23. ADC Prescaler Selections
ADPS2
ADPS1
ADPS0
Division Factor
00
02
00
12
01
04
01
18
10
0
16
10
1
32
11
0
64
1
1
1
128
Bit7
6
543
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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