ATtiny261A datasheet(159/292 Pages) ATMEL

159 / 292 page

159

8197A–AVR–10/09

ATtiny261A/461A/861A

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

15.13.5

DIDR0 – Digital Input Disable Register 0

• Bits 7:4,2:0 – ADC6D:ADC0D: ADC6:0 Digital Input Disable

When this bit is written logic one, the digital input buffer on the corresponding ADC pin is dis-

abled. The corresponding PIN register bit will always read as zero when this bit is set. When an

analog signal is applied to the ADC7:0 pin and the digital input from this pin is not needed, this

bit should be written logic one to reduce power consumption in the digital input buffer.

• Bit 3 – AREFD: AREF Digital Input Disable

When this bit is written logic one, the digital input buffer on the AREF pin is disabled. The corre-

sponding PIN register bit will always read as zero when this bit is set. When an analog signal is

applied to the AREF pin and the digital input from this pin is not needed, this bit should be written

logic one to reduce power consumption in the digital input buffer.

15.13.6

DIDR1 – Digital Input Disable Register 1

• Bits 7:4 – ADC10D:ADC7D: ADC10:7 Digital Input Disable

When this bit is written logic one, the digital input buffer on the corresponding ADC pin is dis-

abled. The corresponding PIN register bit will always read as zero when this bit is set. When an

analog signal is applied to the ADC10:7 pin and the digital input from this pin is not needed, this

bit should be written logic one to reduce power consumption in the digital input buffer.

Table 15-6.

ADC Auto Trigger Source Selections

ADTS2

ADTS1

ADTS0

Trigger Source

Free Running mode

Analog Comparator

External Interrupt Request 0

Timer/Counter0 Compare Match A

Timer/Counter0 Overflow

Timer/Counter0 Compare Match B

Timer/Counter1 Overflow

Watchdog Interrupt Request

Bit

7654

0x01 (0x21)

ADC6D

ADC5D

ADC4D

ADC3D

AREFD

ADC2D

ADC1D

ADC0D

DIDR0

Read/Write

R/W

Initial Value

0000

Bit

432

0x02 (0x22)

ADC10D

ADC9D

ADC8D

ADC7D

DIDR1

Read/Write

R/WR/W

Initial Value

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