3 analog comparator 2 control register - ac2con – Rainbow Electronics ATmega64C1 User Manual
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7647A–AVR–02/08
ATmega32/64/M1/C1
These 3 bits determine the input of the negative input of the analog comparator.
The different setting are shown in
20.4.3
Analog Comparator 2 Control Register – AC2CON
• 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
• Bit 3 – Res: Reserved Bit
This bit is an unused bit in the ATmega32/64/M1/C1, and will always read as zero.
• Bit 2, 1, 0– AC2M2, AC2M1, AC2M0: Analog Comparator 2 Multiplexer register
Table 20-4.
Analog Comparator 1 negative input selection
AC1M2
AC1M1
AC1M0
Description
0
0
0
“Vref”/6.40
0
0
1
“Vref”/3.20
0
1
0
“Vref”/2.13
0
1
1
“Vref”/1.60
1
0
0
Bandgap (1.1V)
1
0
1
DAC result
1
1
0
Analog Comparator Negative Input (ACMPM pin)
1
1
1
Reserved
Bit
7
6
5
4
3
2
1
0
AC2EN
AC2IE
AC2IS1
AC2IS0
-
AC2M2
AC2M1
AC2M0
AC2CON
Read/Write
R/W
R/W
R/W
R/W
-
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 20-5.
Interrupt sensitivity selection
AC2IS1
AC2IS0
Description
0
0
Comparator Interrupt on output toggle
0
1
Reserved
1
0
Comparator interrupt on output falling edge
1
1
Comparator interrupt on output rising edge