ATtiny44 datasheet(131/236 Pages) ATMEL

131 / 236 page

131

8006H–AVR–10/09

ATtiny24/44/84

between the Analog Comparator and the input capture function exists. To make the comparator

trigger the Timer/Counter1 Input Capture inter-rupt, the ICIE1 bit in the Timer Interrupt Mask

• Bits 1, 0 – ACIS1, ACIS0: Analog Comparator Interrupt Mode Select

These bits determine which comparator events that trigger the Analog Comparator interrupt. The

different settings are shown in Table 15-2.

When changing the ACIS1/ACIS0 bits, the Analog Comparator Interrupt must be disabled by

clearing its Interrupt Enable bit in the ACSR Register. Otherwise an interrupt can occur when the

bits are changed.

15.2.2

ADCSRB – ADC Control and Status Register B

• Bit 6 – ACME: Analog Comparator Multiplexer Enable

When this bit is written logic one and the ADC is switched off (ADEN in ADCSRA is zero), the

ADC multiplexer selects the negative input to the Analog Comparator. When this bit is written

logic zero, AIN1 is applied to the negative input of the Analog Comparator. For a detailed

description of this bit, see “Analog Comparator Multiplexed Input” on page 129.

15.2.3

DIDR0 – Digital Input Disable Register 0

• Bits 2, 1– ADC2D, ADC1D: ADC 2/1 Digital input buffer disable

When this bit is written logic one, the digital input buffer on the AIN1/0 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 AIN1/0 pin and the digital input from this pin is not needed, this bit should be writ-

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

Table 15-2.

ACIS1/ACIS0 Settings

ACIS1

ACIS0

Interrupt Mode

Comparator Interrupt on Output Toggle.

Reserved

Comparator Interrupt on Falling Output Edge.

Comparator Interrupt on Rising Output Edge.

Bit

6543210

0x03 (0x23)

BIN

ACME

–

ADLAR

–

ADTS2

ADTS1

ADTS0

ADCSRB

Read/Write

R/W

RR/W

R/W

Initial Value

0000000

Bit

765

432

0x01 (0x21)

ADC7D

ADC6D

ADC5D

ADC4D

ADC3D

ADC2D

ADC1D

ADC0D

DIDR0

Read/Write

R/W

Initial Value

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