AT90PWM3_08 Datasheet, PDF (227/361 Pages) ATMEL Corporation – 8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Figure 20-1. Analog Comparator Block Diagram⁽¹⁾⁽²⁾
ACMP0
CLK I/O (/2)
+
-
AC0EN
Interrupt Sensitivity Control
AC0IS1
AC0IS0
AC0O
AC0IF
Analog Comparator 0 Interrupt
AC0IE
ACMP1
ACMP2
ACMPM
DAC
Vref
DAC
Result
Aref
AVcc
Internal 2.56V
Reference
DACEN
REFS0
REFS1
/1.60
/2.13
/3.20
/6.40
AC0M
210
CLK I/O (/2)
+
-
AC1EN
Interrupt Sensitivity Control
AC1IS1
AC1IS0
AC1M
210
CLK I/O (/2)
+
-
AC2EN
Interrupt Sensitivity Control
AC2IS1
AC2IS0
AC1O
AC1IF
Analog Comparator 1 Interrupt
AC1IE
T1 Capture Trigger
AC1ICE
AC2O
AC2IF
Analog Comparator 2 Interrupt
AC0IE
AC2M
210
Notes: 1. ADC multiplexer output: see Table 27 on page 248.
2. Refer to Figure 3-1 on page 3 and for Analog Comparator pin placement.
3. The voltage on Vref is defined in 26 “ADC Voltage Reference Selection” on page 247
20.2 Analog Comparator Register Description
Each analog comparator has its own control register.
A dedicated register has been designed to consign the outputs and the flags of the 3 analog
comparators.
20.2.1
Analog Comparator 0 Control Register – AC0CON
Bit
Read/Write
Initial Value
7
6
5
4
3
2
1
AC0EN
AC0IE
AC0IS1
AC0IS0
-
AC0M2
AC0M1
R/W
R/W
R/W
R/W
-
R/W
R/W
0
0
0
0
0
0
0
• Bit 7– AC0EN: Analog Comparator 0 Enable Bit
Set this bit to enable the analog comparator 0.
Clear this bit to disable the analog comparator 0.
• Bit 6– AC0IE: Analog Comparator 0 Interrupt Enable bit
Set this bit to enable the analog comparator 0 interrupt.
Clear this bit to disable the analog comparator 0 interrupt.
• Bit 5, 4– AC0IS1, AC0IS0: Analog Comparator 0 Interrupt Select bit
0
AC0M0
R/W
0
AC0CON
228 AT90PWM2/3/2B/3B
4317I–AVR–01/08