at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 194

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

17. Analog Comparator
17.1
17.2
194
Features
Overview
AT90PWM81
The Analog Comparator compares the input values on the positive pin ACMPx and negative pin ACMPM
or ACMPMx.
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The AT90PWM81 features 3 fast analog comparators.
Each comparator has a dedicated input on the positive input, and the negative input of each comparator
can be configured as:
When the voltage on the positive ACMPn pin is higher than the voltage selected by the ACnM multiplexer
on the negative input, the Analog Comparator output, ACnO, is set.
Each comparator can trigger a separate interrupt, exclusive to the Analog Comparator. In addition, the
user can select Interrupt triggering on comparator output rise, fall or toggle.
The interrupt flags can also be used to synchronize ADC or DAC conversions.
Moreover, the comparator’s output of the comparator 1 can be set to trigger the Timer/Counter1 Input
Capture function.
A block diagram of the comparators and their surrounding logic is shown in
• a steady value among the 4 internal reference levels defined by the Vref selected thanks to the
• a value generated from the internal DAC
• an external analog input ACMPMx.
3 Analog Comparators
High Speed analog Comparators
+/-25mV or +/-10mV or 0 Hysteresis
4 reference levels
Generation of Configurable Interrupts
REFS1:0 bits in ADMUX register.
Figure
17-1.
7734M–AVR–03/10