ATmega1281 Atmel Corporation, ATmega1281 Datasheet - Page 280

• Manufacturer Part Number: ATmega1281
• Manufacturer: Atmel Corporation

Specifications of ATmega1281

• Flash (kbytes): 128 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 54
• Ext Interrupts: 17
• Usb Speed: No
• Usb Interface: No
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 8
• Eeprom (bytes): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 6
• Output Compare Channels: 16
• Input Capture Channels: 2
• Pwm Channels: 8
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

2549N–AVR–05/11
Figure 26-5. ADC Timing Diagram, Single Conversion
Figure 26-6. ADC Timing Diagram, Auto Triggered Conversion
Figure 26-7. ADC Timing Diagram, Free Running Conversion
Cycle Number
ADC Clock
Trigger
Source
ADATE
ADIF
ADCH
ADCL
Cycle Number
ADC Clock
ADSC
ADIF
ADCH
ADCL
Prescaler
Reset
1
MUX and REFS
Update
Cycle Number
ADC Clock
ADSC
ADIF
ADCH
ADCL
1
2
MUX and REFS
Update
2
3
Conversion
Complete
Sample & Hold
3
ATmega640/1280/1281/2560/2561
4
One Conversion
Sample &
Hold
11
4
5
12
5
6
6
13
7
One Conversion
7
8
One Conversion
Next Conversion
1
Sign and MSB of Result
LSB of Result
8
9
2
MUX and REFS
Update
9
10
Conversion
Complete
3
10
Conversion
11
Complete
Sample & Hold
11
4
12
12
13
13
Sign and MSB of Result
LSB of Result
Next Conversion
Sign and MSB of Result
1
LSB of Result
2
MUX and REFS
Update
Next Conversion
1
Prescaler
Reset
3
2
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