ATMEGA649V-8AU Atmel, ATMEGA649V-8AU Datasheet - Page 37

• Manufacturer Part Number: ATMEGA649V-8AU
• Description: IC AVR MCU FLASH 64K 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA649V-8AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART, USI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Package: 64TQFP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 8 MHz
• Cpu Family: ATmega
• Device Core Size: 8b
• Frequency (max): 8MHz
• Total Internal Ram Size: 4KB
• # I/os (max): 54
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: TQFP
• For Use With: ATSTK600-TQFP64 - STK600 SOCKET/ADAPTER 64-TQFP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEMATJTAGICE2 - AVR ON-CHIP D-BUG SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.5
9.6
9.7
9.7.1
9.7.2
2552K–AVR–04/11
Standby Mode
Power Reduction Register
Minimizing Power Consumption
Analog to Digital Converter
Analog Comparator
If Timer/Counter2 and/or the LCD controller are enabled, they will keep running during sleep.
The device can wake up from either Timer Overflow or Output Compare event from
Timer/Counter2 if the corresponding Timer/Counter2 interrupt enable bits are set in TIMSK2,
and the Global Interrupt Enable bit in SREG is set. It can also wake up from an LCD controller
interrupt.
If neither Timer/Counter2 nor the LCD controller is running, Power-down mode is recommended
instead of Power-save mode.
The LCD controller and Timer/Counter2 can be clocked both synchronously and asynchronously
in Power-save mode. The clock source for the two modules can be selected independent of
each other. If neither the LCD controller nor the Timer/Counter2 is using the asynchronous
clock, the Timer/Counter Oscillator is stopped during sleep. If neither the LCD controller nor the
Timer/Counter2 is using the synchronous clock, the clock source is stopped during sleep. Note
that even if the synchronous clock is running in Power-save, this clock is only available for the
LCD controller and Timer/Counter2.
When the SM2..0 bits are 110 and an external crystal/resonator clock option is selected, the
SLEEP instruction makes the MCU enter Standby mode. This mode is identical to Power-down
with the exception that the Oscillator is kept running. From Standby mode, the device wakes up
in six clock cycles.
The Power Reduction Register (PRR), see
vides a method to stop the clock to individual peripherals to reduce power consumption. The
current state of the peripheral is frozen and the I/O registers inaccessible. Resources used by
the peripheral when stopping the clock will remain occupied so the peripheral should be disabled
before stopping the clock. Waking up a peripheral, which is done by clearing the bit in PRR, puts
the peripheral in the same state as before shutdown.
Peripheral shutdown can be used in Idle mode and Active mode to reduce the overall power
consumption. In all other sleep modes, the clock is already stopped.
There are several possibilities to consider when trying to minimize the power consumption in an
AVR controlled system. In general, sleep modes should be used as much as possible, and the
sleep mode should be selected so that as few as possible of the device’s functions are operat-
ing. All functions not needed should be disabled. In particular, the following modules may need
special consideration when trying to achieve the lowest possible power consumption.
If enabled, the ADC will be enabled in all sleep modes. To save power, the ADC should be dis-
abled before entering any sleep mode. When the ADC is turned off and on again, the next
conversion will be an extended conversion. Refer to
for details on ADC operation.
When entering Idle mode, the Analog Comparator should be disabled if not used. When entering
ADC Noise Reduction mode, the Analog Comparator should be disabled. In other sleep modes,
“PRR – Power Reduction Register” on page
ATmega329/3290/649/6490
“Analog to Digital Converter” on page 211
40, pro-
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