Table 20-6. Analog Comparator 2 Negative Input Selection
AC2M2
AC2M1
AC2M0
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
20.4.4 Analog Comparator 3 Control Register – AC3CON
Bit
7
6
5
4
3
-
2
1
0
AC3EN AC3IE AC3IS1 AC3IS0
AC3M2 AC3M1 AC3M0 AC3CON
Read/Write
Initial Value
R/W
0
R/W
0
R/W
0
R/W
0
-
R/W
0
R/W
0
R/W
0
0
• Bit 7– AC3EN: Analog Comparator 3 Enable Bit
Set this bit to enable the analog comparator 3.
Clear this bit to disable the analog comparator 3.
• Bit 6– AC3IE: Analog Comparator 3 Interrupt Enable bit
Set this bit to enable the analog comparator 3 interrupt.
Clear this bit to disable the analog comparator 3 interrupt.
• Bit 5, 4– AC3IS1, AC3IS0: Analog Comparator 3 Interrupt Select bit
These 2 bits determine the sensitivity of the interrupt trigger.
The different setting are shown in Table 18-7.
Table 20-7. Interrupt Sensitivity Selection
AC3IS1
AC3IS0
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– AC3M2, AC3M1, AC3M0: Analog Comparator 3 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.
230
ATmega16/32/64/M1/C1 [DATASHEET]
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
