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ATtiny26(L)

1477G–AVR–03/05

Analog Comparator The Analog Comparator compares the input values on the positive pin PA6 (AIN0) and

negative pin PA7 (AIN1). When the voltage on the positive pin PA6 (AIN0) is higher than

the voltage on the negative pin PA7 (AIN1), the Analog Comparator Output, ACO is set

(one). The comparator’s output 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 diagram of the comparator and its surrounding logic is shown in the Fig-

ure 50.

Figure 50. Analog Comparator Block Diagram

Analog Comparator Control

and Status Register – ACSR

• Bit 7 – ACD: Analog Comparator Disable

When this bit is set(one), the power to the Analog Comparator is switched off. This bit

can be set at any time to turn off the Analog Comparator. When changing the ACD bit,

the Analog Comparator Interrupt must be disabled by clearing the ACIE bit in ACSR.

Otherwise an interrupt can occur when the bit is changed.

• Bit 6 – ACBG: Analog Comparator Bandgap Select

When this bit is set (one), it selects internal bandgap reference voltage (1.18V) as the

positive comparator input.

• Bit 5 – ACO: Analog Comparator Output

ACO is directly connected to the comparator output.

PA6

(AIN0)

PA7

MUX

ADC

MULTIPLEXER OUTPUT

(AIN1)

ACBG

ACME

Bit 76543210

$08 ($28) ACD ACBG ACO ACI ACIE ACME ACIS1 ACIS0 ACSR

Read/Write R/W R/W R R/W R/W R/W R/W R/W

Initial Value 0 0 X 0 0 0 0 0

Atmel ATtiny26 User Manual

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