ATtiny25 datasheet(108/196 Pages) ATMEL

108 / 196 page

108

7598H–AVR–07/09

ATtiny25/45/85

17. Analog Comparator

The Analog Comparator compares the input values on the positive pin AIN0 and negative pin

AIN1. When the voltage on the positive pin AIN0 is higher than the voltage on the negative pin

AIN1, the Analog Comparator output, ACO, is set. The comparator can trigger a separate inter-

rupt, exclusive to the Analog Comparator. The user can select Interrupt triggering on comparator

output rise, fall or toggle. A block diagram of the comparator and its surrounding logic is shown

in Figure 17-1.

Figure 17-1. Analog Comparator Block Diagram

(2)

Notes:

1. See Table 17-2 on page 110.

2. Refer to Figure 1-1 on page 2 and Table 10-5 on page 57 for Analog Comparator pin

placement.

17.1

ADC Control and Status Register B – ADCSRB

• 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 110.

17.2

Analog Comparator Control and Status Register – ACSR

• Bit 7 – ACD: Analog Comparator Disable

When this bit is written logic one, the power to the Analog Comparator is switched off. This bit

can be set at any time to turn off the Analog Comparator.

ACBG

BANDGAP

REFERENCE

ADC MULTIPLEXER

OUTPUT

ACME

ADEN

(1)

Bit

654

3210

BIN

ACME

IPR

–

ADTS2

ADTS1

ADTS0

ADCSRB

Read/Write

R/W

Initial Value

000

0000

Bit

765

4321

ACD

ACBG

ACO

ACI

ACIE

–

ACIS1

ACIS0

ACSR

Read/Write

R/W

Initial Value

N/A

0000

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