Table 20-4. Analog Comparator 1 Negative Input Selection
AC1M2
AC1M1
AC1M0
Description
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
“Vref”/6.40
“Vref”/3.20
“Vref”/2.13
“Vref”/1.60
Bandgap (1.1V)
DAC result
Analog comparator Negative Input (ACMPM pin)
Reserved
20.4.3 Analog Comparator 2 Control Register – AC2CON
Bit
7
AC2EN
R/W
0
6
AC2IE
R/W
0
5
4
3
-
2
1
0
AC2IS1 AC2IS0
AC2M2 AC2M1 AC2M0 AC2CON
Read/Write
Initial Value
R/W
0
R/W
0
-
R/W
0
R/W
0
R/W
0
0
• Bit 7– AC2EN: Analog Comparator 2 Enable Bit
Set this bit to enable the analog comparator 2.
Clear this bit to disable the analog comparator 2.
• Bit 6– AC2IE: Analog Comparator 2 Interrupt Enable Bit
Set this bit to enable the analog comparator 2 interrupt.
Clear this bit to disable the analog comparator 2 interrupt.
• Bit 5, 4– AC2IS1, AC2IS0: Analog Comparator 2 Interrupt Select Bit
These 2 bits determine the sensitivity of the interrupt trigger.
The different setting are shown in Table 18-7.
Table 20-5. Interrupt Sensitivity Selection
AC2IS1
AC2IS0
Description
0
0
1
1
0
1
0
1
Comparator Interrupt on output toggle
Reserved
Comparator interrupt on output falling edge
Comparator interrupt on output rising edge
Bit 3 – Res: Reserved Bit
This bit is an unused bit in the ATmega16/32/64/M1/C1, and will always read as zero.
• Bit 2, 1, 0– AC2M2, AC2M1, AC2M0: analog comparator 2 Multiplexer register
These 3 bits determine the input of the negative input of the analog comparator.
The different setting are shown in Table 20-6 on page 230.
ATmega16/32/64/M1/C1 [DATASHEET]
229
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
