ATtiny5 datasheet(81/168 Pages) ATMEL

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8127C–AVR–10/09

ATtiny4/5/9/10

12. 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 12-1.

Figure 12-1. Analog Comparator Block Diagram.

See Figure 1-1 on page 2 for pin use of analog comparator, and Table 10-4 on page 49 and

Table 10-5 on page 50 for alternate pin usage.

12.1 Register Description

12.1.1

ACSR – Analog Comparator Control and Status Register

• 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, thus reducing power consumption in

Active and Idle mode. When changing the ACD bit, the analog comparator Interrupt must be dis-

abled by clearing the ACIE bit in ACSR. Otherwise an interrupt can occur when the bit is

changed.

• Bits 6 – Res: Reserved Bit

This bit is reserved and will always read zero.

• Bit 5 – ACO: Analog Comparator Output

Enables output of analog comparator. The output of the analog comparator is synchronized and

then directly connected to ACO. The synchronization introduces a delay of 1 - 2 clock cycles.

Bit

765

4321

0x1F

ACD

–

ACO

ACI

ACIE

ACIC

ACIS1

ACIS0

ACSR

Read/Write

R/W

Initial Value

000

0000

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