Datasheet

Bits 1:0 – ACIS[1:0] Analog Comparator Interrupt Mode Select
These bits determine which comparator events that trigger the analog comparator interrupt.
Table 27-2. ACIS[1:0] Settings
ACIS1 ACIS0 Interrupt Mode
0 0 Comparator interrupt on output toggle.
0 1 Reserved
1 0 Comparator interrupt on falling output edge.
1 1 Comparator interrupt on rising output edge.
When changing the ACIS1/ACIS0 bits, the analog comparator Interrupt must be disabled by clearing its
interrupt enable bit in the ACSR register. Otherwise, an interrupt can occur when the bits are changed.
ATmega48PA/88PA/168PA
Analog Comparator (AC)
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Datasheet Complete
DS40002011A-page 312