ATtiny88 datasheet(171/266 Pages) ATMEL

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171

8008C–AVR–03/09

ATtiny48/88

•

Bit 5 – ADLAR: ADC Left Adjust Result

The ADLAR bit affects the presentation of the ADC conversion result in the ADC Data Register.

Write one to ADLAR to left adjust the result. Otherwise, the result is right adjusted. Changing the

ADLAR bit will affect the ADC Data Register immediately, regardless of any ongoing conver-

sions. For a complete description of this bit, see “ADCL and ADCH – The ADC Data Register” on

page 173.

• Bits 3:0 – MUX3:0: Analog Channel Selection Bits

The value of these bits selects which analog inputs are connected to the ADC. Selecting the sin-

gle-ended channel ADC8 enables the temperature measurement. See Table 17-4 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).

Note:

1. “Temperature Measurement” on page 169

17.13.2

ADCSRA – ADC Control and Status Register A

• 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.

Table 17-4.

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

ADC8(1)

1001

(reserved)

1010

(reserved)

1011

(reserved)

1100

(reserved)

1101

(reserved)

1110

1.1V (VBG)

1111

0V (GND)

Bit

765

210

ADEN

ADSC

ADATE

ADIF

ADIE

ADPS2

ADPS1

ADPS0

ADCSRA

Read/Write

R/W

Initial Value

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