249
ATmega16M1/32M1/64M1 [DATASHEET]
8209E–AVR–11/2012
23.4.5
ACSR – Analog Comparator Status Register
Bit 7 – AC3IF: Analog Comparator 3 Interrupt Flag Bit
This bit is set by hardware when Comparator 3 output event triggers off the interrupt mode defined by AC3IS1 and
AC3IS0 bits in AC2CON register.
This bit is cleared by hardware when the corresponding interrupt vector is executed in case the AC3IE in AC3CON
register is set. Anyway, this bit is cleared by writing a logical one on it.
This bit can also be used to synchronize ADC or DAC conversions.
Bit 6 – AC2IF: Analog Comparator 2 Interrupt Flag Bit
This bit is set by hardware when Comparator 2 output event triggers off the interrupt mode defined by AC2IS1 and
AC2IS0 bits in AC2CON register.
This bit is cleared by hardware when the corresponding interrupt vector is executed in case the AC2IE in AC2CON
register is set. Anyway, this bit is cleared by writing a logical one on it.
This bit can also be used to synchronize ADC or DAC conversions.
Bit 5 – AC1IF: Analog Comparator 1 Interrupt Flag Bit
This bit is set by hardware when Comparator 1 output event triggers off the interrupt mode defined by AC1IS1 and
AC1IS0 bits in AC1CON register.
This bit is cleared by hardware when the corresponding interrupt vector is executed in case the AC1IE in AC1CON
register is set. Anyway, this bit is cleared by writing a logical one on it.
This bit can also be used to synchronize ADC or DAC conversions.
Bit 4 – AC0IF: Analog Comparator 0 Interrupt Flag Bit
This bit is set by hardware when Comparator 0 output event triggers off the interrupt mode defined by AC0IS1 and
AC0IS0 bits in AC0CON register.
This bit is cleared by hardware when the corresponding interrupt vector is executed in case the AC0IE in AC0CON
register is set. Anyway, this bit is cleared by writing a logical one on it.
This bit can also be used to synchronize ADC or DAC conversions.
Table 23-8.
Analog Comparator 3 negative input selection.
AC3M[2:0]
Description
000
“VREF”/6.40
001
“V
REF”/3.20
010
“VREF”/2.13
011
“VREF”/1.60
100
Bandgap (1.1V)
101
DAC result
110
Analog comparator negative input (ACMPM pin)
111
Reserved
Bit
7
654
3
2
1
0
AC3IF
AC2IF
AC1IF
AC0IF
AC3O
AC2O
AC1O
AC0O
ACSR
Read/write
R/W
R
Initial value
0