ATmega165 datasheet(186/336 Pages) ATMEL

186 / 336 page

186

ATmega165/V

2573G–AVR–07/09

Analog Comparator

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

tive 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’s

output can be set to trigger the Timer/Counter1 Input Capture function. In addition, the

comparator can trigger a separate interrupt, exclusive to the Analog Comparator. The

user can select Interrupt triggering on comparator output rise, fall or toggle. A block dia-

gram of the comparator and its surrounding logic is shown in Figure 82

The Power Reduction ADC bit, PRADC, in “Power Reduction Register - PRR” on page

34 must be

disabled by writing a logical zero to be able to use the ADC input MUX.

Figure 82. Analog Comparator Block Diagram(2)

Notes:1. See Table 79 on page 188.

Refer to Figure 1 on page 2 and Table 32 on page 66 for Analog Comparator pin

placement.

ADC Control and Status

• 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 Compar-

ator. For a detailed description of this bit, see “Analog Comparator Multiplexed Input” on

page 188.

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. This will reduce power

ACBG

BANDGAP

REFERENCE

ADC MULTIPLEXER

OUTPUT

ACME

ADEN

(1)

AIN0

AIN1

ACD

VCC

ACIE

INTERRUPT

SELECT

ACIS1

ACIS0

ACIC

ACO

ANALOG

COMPARATOR

IRQ

ACI

TO T/C1 CAPTURE

TRIGGER MUX

Bit

654

3210

–

ACME

–

ADTS2

ADTS1

ADTS0

ADCSRB

Read/Write

R/W

Initial Value

000

0000

Bit

7654

321

ACD

ACBG

ACO

ACI

ACIE

ACIC

ACIS1

ACIS0

ACSR

Read/Write

R/W

Initial Value

N/A

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