AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 194
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AT90PWM81
Manufacturer Part Number
AT90PWM81
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT90PWM161.pdf
(325 pages)
Specifications of AT90PWM81
Flash (kbytes)
8 Kbytes
Pin Count
20
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
20
Ext Interrupts
3
Usb Speed
No
Usb Interface
No
Spi
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
3
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
0.25
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
1
Output Compare Channels
8
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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16. Analog Comparator
16.1
16.2
194
Features
Overview
AT90PWM81
The Analog Comparator compares the input values on the positive pin ACMPx and negative pin ACMPM
or ACMPMx.
•
•
•
•
•
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
16-1.
7734P–AVR–08/10
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