Datasheet

192
ATmega8(L)
2486M–AVR–12/03
When changing the ACIS1/ACIS0 bits, the Analog Comparator Interrupt must be dis-
abled by clearing its Interrupt Enable bit in the ACSR Register. Otherwise an interrupt
can occur when the bits are changed.
Analog Comparator
Multiplexed Input
It is possible to select any of the ADC7..0
(1)
pins to replace the negative input to the
Analog 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 Multi-
plexer Enable bit (ACME in SFIOR) is set and the ADC is switched off (ADEN in
ADCSRA is zero), MUX2..0 in ADMUX select the input pin to replace the negative input
to the Analog Comparator, as shown in Table 72. If ACME is cleared or ADEN is set,
AIN1 is applied to the negative input to the Analog Comparator.
Note: 1. ADC7..6 are only available in TQFP and MLF Package.
Table 72. Analog Comparator Multiplexed Input
(1)
ACME ADEN MUX2..0 Analog Comparator Negative Input
0 x xxx AIN1
1 1 xxx AIN1
1 0 000 ADC0
1 0 001 ADC1
1 0 010 ADC2
1 0 011 ADC3
1 0 100 ADC4
1 0 101 ADC5
1 0 110 ADC6
1 0 111 ADC7