Rainbow Electronics ATmega64M1 - Manual (Page 261)

261
8209A–AVR–08/09
ATmega16M1/32M1/64M1
• Bit 3 – Res: Reserved
This bit is reserved and will always read as zero.
• Bit 2:0– AC2M[2:0]: 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 24-6 .
24.4.4 AC3CON – Analog Comparator 3 Control Register
• 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– AC3IS[1:0]: Analog Comparator 3 Interrupt Select bit
These 2 bits determine the sensitivity of the interrupt trigger.
The different setting are shown in
Table 24-1
Table 24-5. Interrupt sensitivity selection
AC2IS[1:0] Description
00 Comparator Interrupt on output toggle
01 Reserved
10 Comparator interrupt on output falling edge
11 Comparator interrupt on output rising edge
Table 24-6. Analog Comparator 2 negative input selection
AC2M[2:0] Description
000 “Vref”/6.40
001 “Vref”/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 6 5 4 3 2 1 0
AC3EN AC3IE AC3IS1 AC3IS0 - AC3M2 AC3M1 AC3M0 AC3CON
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