ATmega32A datasheet(226/352 Pages) ATMEL

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8155B–AVR–07/09

ATmega32A

22.9.4

SFIOR – Special FunctionIO Register

• Bit 7:5 – 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 4 – Res: Reserved Bit

This bit is reserved for future use in the ATmega32A. For ensuring compability with future

devices, this bit must be written zero when SFIOR is written.

Bit

3210

ADTS2

ADTS1

ADTS0

–

ACME

PUD

PSR2

PSR10

SFIOR

Read/Write

R/W

Initial Value

0000

Table 22-6.

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

ATmega32A Datasheet(PDF) 226 Page - ATMEL Corporation

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