ATMEGA644A-MU Atmel, ATMEGA644A-MU Datasheet - Page 246
![IC MCU AVR 64K FLASH 44VQFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
ATMEGA644A-MU
Manufacturer Part Number
ATMEGA644A-MU
Description
IC MCU AVR 64K FLASH 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-MU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
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
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8272A–AVR–01/10
Figure 22-5. ADC Timing Diagram, Single Conversion
Figure 22-6. ADC Timing Diagram, Auto Triggered Conversion
Figure 22-7. ADC Timing Diagram, Free Running Conversion
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Cycle Number
ADC Clock
ADSC
ADIF
ADCH
ADCL
Cycle Number
ADC Clock
Trigger
Source
ADATE
ADIF
ADCH
ADCL
Prescaler
Reset
1
Cycle Number
ADC Clock
ADSC
ADIF
ADCH
ADCL
MUX and REFS
Update
1
2
MUX and REFS
Update
2
3
Conversion
Complete
3
Sample & Hold
One Conversion
4
Sample & Hold
11
4
5
12
5
6
6
13
7
One Conversion
7
One Conversion
Next Conversion
1
8
MSB of Result
LSB of Result
8
9
2
MUX and REFS
Update
9
Conversion
10
Conversion
Complete
10
Complete
3
11
11
Sample & Hold
4
12
12
13
13
MSB of Result
LSB of Result
MSB of Result
LSB of Result
Next Conversion
1
MUX and REFS
Update
Next Conversion
1
Prescaler
Reset
2
2
3
246
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