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AT90USB646 Datasheet(PDF) 331 Page - ATMEL Corporation

Part # AT90USB646
Description  Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  434 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 331 Page - ATMEL Corporation

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331
7593A–AVR–02/06
AT90USB64/128
25.8.2
ADC Control and Status Register A – ADCSRA
• Bit 7 – ADEN: ADC Enable
Writing this bit to one enables the ADC. By writing it to zero, the ADC is turned off. Turning the
ADC off while a conversion is in progress, will terminate this conversion.
• Bit 6 – ADSC: ADC Start Conversion
In Single Conversion mode, write this bit to one to start each conversion. In Free Running mode,
write this bit to one to start the first conversion. The first conversion after ADSC has been written
after the ADC has been enabled, or if ADSC is written at the same time as the ADC is enabled,
01000
N/A
(ADC0 / ADC0 / 10x)
01001
ADC1
ADC0
10x
01010
(ADC0 / ADC0 / 200x)
01011
ADC1
ADC0
200x
01100
(Reserved - ADC2 / ADC2 / 10x)
01101
ADC3
ADC2
10x
01110
(ADC2 / ADC2 / 200x)
01111
ADC3
ADC2
200x
10000
ADC0
ADC1
1x
10001
(ADC1 / ADC1 / 1x)
10010
ADC2
ADC1
1x
10011
ADC3
ADC1
1x
10100
ADC4
ADC1
1x
10101
ADC5
ADC1
1x
10110
ADC6
ADC1
1x
10111
ADC7
ADC1
1x
11000
ADC0
ADC2
1x
11001
ADC1
ADC2
1x
11010
(ADC2 / ADC2 / 1x)
11011
ADC3
ADC2
1x
11100
ADC4
ADC2
1x
11101
ADC5
ADC2
1x
11110
1.1V (VBand Gap)
N/A
11111
0V (GND)
Table 25-4.
Input Channel and Gain Selections (Continued)
MUX4..0
Single Ended
Input
Positive Differential
Input
Negative Differential
Input
Gain
Bit
765
43
210
ADEN
ADSC
ADATE
ADIF
ADIE
ADPS2
ADPS1
ADPS0
ADCSRA
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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