ATmega64A datasheet(251/392 Pages) ATMEL

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251

8160C–AVR–07/09

ATmega64A

• ADC9:0: ADC Conversion Result

These bits represent the result from the conversion, as detailed in “ADC Conversion Result” on

page 245.

23.9.4

ADCSRB – ADC Control and Status Register B

• Bits 7:3 – Res: Reserved Bits

These bits are reserved bits in the ATmega64A and will always read as zero.

• Bit 2:0 – ADTS2:0: ADC Auto Trigger Source

If ADATE in ADCSRA is written to one, the value of these bits selects which source will trigger

an ADC conversion. If ADATE is cleared, the ADTS2:0 settings will have no effect. A conversion

will be triggered by the rising edge of the selected interrupt flag. Note that switching from a trig-

ger source that is cleared to a trigger source that is set, will generate a positive edge on the

trigger signal. If ADEN in ADCSRA is set, this will start a conversion. Switching to Free Running

mode (ADTS[2:0]=0) will not cause a trigger event, even if the ADC Interrupt Flag is set

Bit

765

43210

(0x8E)

–

ADTS2

ADTS1

ADTS0

ADCSRB

Read/Write

RRRR

R/W

Initial Value

000

00000

Table 23-6.

ADC Auto Trigger Source Selections

ADTS2

ADTS1

ADTS0

Trigger Source

Free Running mode

Analog Comparator

External Interrupt Request 0

Timer/Counter0 Compare Match

Timer/Counter0 Overflow

Timer/Counter1 Compare Match B

Timer/Counter1 Overflow

Timer/Counter1 Capture Event

ATmega64A Datasheet(PDF) 251 Page - ATMEL Corporation

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