ATmega88 datasheet(250/340 Pages) ATMEL

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250

7530H–AVR–02/09

ATmega48/88/168 Automotive

The value of these bits selects which analog inputs are connected to the ADC. See Table 21-3

for details. If these bits are changed during a conversion, the change will not go in effect until this

conversion is complete (ADIF in ADCSRA is set).

21.6.2

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,

will take 25 ADC clock cycles instead of the normal 13. This first conversion performs initializa-

tion of the ADC.

ADSC will read as one as long as a conversion is in progress. When the conversion is complete,

it returns to zero. Writing zero to this bit has no effect.

Table 21-3.

Input Channel Selections

MUX3..0

Single Ended Input

0000

ADC0

0001

ADC1

0010

ADC2

0011

ADC3

0100

ADC4

0101

ADC5

0110

ADC6

0111

ADC7

1000

(reserved)

1001

(reserved)

1010

(reserved)

1011

(reserved)

1100

(reserved)

1101

(reserved)

1110

1.1V (VBG)

1111

0V (GND)

Bit

76543210

ADEN

ADSC

ADATE

ADIF

ADIE

ADPS2

ADPS1

ADPS0

ADCSRA

Read/Write

R/W

Initial Value

00000000

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