ATtiny44 datasheet(129/236 Pages) ATMEL

129 / 236 page

129

8006H–AVR–10/09

ATtiny24/44/84

15. 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 15-1.

Figure 15-1. Analog Comparator Block Diagram

Notes:

1. See Table 15-1 on page 129.

See Figure 1-1 on page 2 and Table 10-9 on page 67 for Analog Comparator pin placement.

15.1

Analog Comparator Multiplexed Input

When the Analog to Digital Converter (ADC) is configurated as single ended input channel, it is

possible to select any of the ADC7..0 pins to replace the negative input to the Analog Compara-

tor. The ADC multiplexer is used to select this input, and consequently, the ADC must be

switched off to utilize this feature. If the Analog Comparator Multiplexer Enable bit (ACME in

ADCSRB) is set and the ADC is switched off (ADEN in ADCSRA is zero), MUX1..0 in ADMUX

select the input pin to replace the negative input to the analog comparator, as shown in Table

15-1. If ACME is cleared or ADEN is set, AIN1 is applied to the negative input to the analog

comparator.

ACBG

BANDGAP

REFERENCE

ADC MULTIPLEXER

OUTPUT

ACME

ADEN

(1)

ACIC

To T/C1 Capture

Trigger MUX

Table 15-1.

Analog Comparator Multiplexed Input

ACME

ADEN

MUX4..0

Analog Comparator Negative Input

XXXXX

AIN1

XXXXX

AIN1

00000

ADC0

00001

ADC1

00010

ADC2

00011

ADC3

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