229
4317I–AVR–01/08
AT90PWM2/3/2B/3B
These 2 bits determine the sensitivity of the interrupt trigger.
The different setting are shown in
.
• Bit 2, 1, 0– AC0M2, AC0M1, AC0M0: Analog Comparator 0 Multiplexer register
These 3 bits determine the input of the negative input of the analog comparator.
The different setting are shown in
.
20.2.2
Analog Comparator 1Control Register – AC1CON
• Bit 7– AC1EN: Analog Comparator 1 Enable Bit
Set this bit to enable the analog comparator 1.
Clear this bit to disable the analog comparator 1.
• Bit 6– AC1IE: Analog Comparator 1 Interrupt Enable bit
Set this bit to enable the analog comparator 1 interrupt.
Clear this bit to disable the analog comparator 1 interrupt.
• Bit 5, 4– AC1IS1, AC1IS0: Analog Comparator 1 Interrupt Select bit
Table 20-1.
Interrupt sensitivity selection
AC0IS1
AC0IS0
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
Table 20-2.
Analog Comparator 0 negative input selection
AC0M2
AC0M1
AC0M0
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
Analog Comparator Negative Input (ACMPM pin)
1
0
1
DAC result
1
1
0
Reserved
1
1
1
Reserved
Bit
7
6
5
4
3
2
1
0
AC1EN
AC1IE
AC1IS1
AC1IS0
AC1ICE
AC1M2
AC1M1
AC1M0
AC1CON
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
