AT90PWM3 datasheet(230/361 Pages) ATMEL

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4317J–AVR–08/10

AT90PWM2/3/2B/3B

• 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 Table 20-1.

• Bit 2, 1, 0– AC2M2, AC2M1, AC2M0: 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 20-6.

20.2.4

Analog Comparator Status Register – ACSR

• Bit 7– ACCKDIV: Analog Comparator Clock Divider

The analog comparators can work with a clock up to 8MHz@3V and 16MHz@5V.

Set this bit in case the clock frequency of the microcontroller is higher than 8 MHz to insert a

divider by 2 between the clock of the microcontroller and the clock of the analog comparators.

Clear this bit to have the same clock frequency for the microcontroller and the analog

comparators.

• Bit 6– AC2IF: Analog Comparator 2 Interrupt Flag Bit

This bit is set by hardware when comparator 2 output event triggers off the interrupt mode

defined by AC2IS1 and AC2IS0 bits in AC2CON register.

This bit is cleared by hardware when the corresponding interrupt vector is executed in case the

Table 20-5.

Interrupt sensitivity selection

AC2IS1

AC2IS0

Description

Comparator Interrupt on output toggle

Reserved

Comparator interrupt on output falling edge

Comparator interrupt on output rising edge

Table 20-6.

Analog Comparator 2 negative input selection

AC2M2

AC2M1

AC2M0

Description

000“Vref”/6.40

001“Vref”/3.20

010“Vref”/2.13

011“Vref”/1.60

100Analog Comparator Negative Input (ACMPM pin)

101DAC result

110Reserved

111Reserved

Bit

654

ACCKDIV

AC2IF

AC1IF

AC0IF

AC2O

AC1O

AC0O

ACSR

Read/Write

R/W

Initial Value

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