ATTINY13 datasheet(79/177 Pages) ATMEL

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ATtiny13

2535G–AVR–01/07

Analog Comparator

Multiplexed Input

It is possible to select any of the ADC3..0 pins to replace the negative input to the Ana-

log Comparator. 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 Ana-

log Comparator, as shown in Table 35. If ACME is cleared or ADEN is set, AIN1 is

applied to the negative input to the Analog Comparator.

Digital Input Disable Register

0 – DIDR0

• Bits 1, 0 – AIN1D, AIN0D: AIN1, AIN0 Digital Input Disable

When this bit is written logic one, the digital input buffer on the AIN1/0 pin is disabled.

The corresponding PIN Register bit will always read as zero when this bit is set. When

an analog signal is applied to the AIN1/0 pin and the digital input from this pin is not

needed, this bit should be written logic one to reduce power consumption in the digital

input buffer.

Table 35. Analog Comparator Multiplexed Input

ACME

ADEN

MUX1..0

Analog Comparator Negative Input

AIN1

ADC0

ADC1

ADC2

ADC3

Bit

7654

321

–

ADC0D

ADC2D

ADC3D

ADC1D

AIN1D

AIN0D

DIDR0

Read/Write

R/W

Initial Value

0000

000

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