ATmega64M1 Automotive Atmel Corporation, ATmega64M1 Automotive Datasheet - Page 262

• Manufacturer Part Number: ATmega64M1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega64M1 Automotive

• Flash (kbytes): 64 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 14
• Input Capture Channels: 1
• Pwm Channels: 10
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

20. Analog Comparator
20.1
20.2
262
Features
Overview
Atmel ATmega16/32/64/M1/C1
The Analog Comparator compares the input values on the positive pin ACMPx and negative
pin ACMPM or ACMPMx.
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The ATmega16/32/64/M1/C1 features 4 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.
The comparator is a clocked comparator. The comparators can run with a clock frequency of
up to 16MHz (typical value) when the supply voltage is in the 4.5V-5.5V range and with a clock
frequency of up to 8MHz (typical value) otherwise.
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 four comparators and their surrounding logic is shown in
• a steady value among the 4 internal reference levels defined by the Vref selected thanks to
• a value generated from the internal DAC
• an external analog input ACMPMx.
4 Analog Comparators
High Speed Clocked Comparators
4 reference levels
Generation of Configurable Interrupts
the REFS1:0 bits in ADMUX register.
7647G–AVR–09/11
Figure
20-1.