ATmega1281 Atmel Corporation, ATmega1281 Datasheet - Page 295

• 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

26.8.6
26.8.7
2549N–AVR–05/11
DIDR0 – Digital Input Disable Register 0
DIDR2 – Digital Input Disable Register 2
ger source that is cleared to a trigger source that is set, will generate a positive edge on the
trigger signal. If ADEN in ADCSRA is set, this will start a conversion. Switching to Free Running
mode (ADTS[2:0]=0) will not cause a trigger event, even if the ADC Interrupt Flag is set
Table 26-6.
Note:
• Bit 7:0 – ADC7D:ADC0D: ADC7:0 Digital Input Disable
When this bit is written logic one, the digital input buffer on the corresponding ADC pin is dis-
abled. The corresponding PIN Register bit will always read as zero when this bit is set. When an
analog signal is applied to the ADC7:0 pin and the digital input from this pin is not needed, this
bit should be written logic one to reduce power consumption in the digital input buffer.
• Bit 7:0 – ADC15D:ADC8D: ADC15:8 Digital Input Disable
When this bit is written logic one, the digital input buffer on the corresponding ADC pin is dis-
abled. The corresponding PIN Register bit will always read as zero when this bit is set. When an
analog signal is applied to the ADC15:8 pin and the digital input from this pin is not needed, this
bit should be written logic one to reduce power consumption in the digital input buffer.
Bit
(0x7E)
Read/Write
Initial Value
Bit
(0x7D)
Read/Write
Initial Value
ADTS2
Free running mode cannot be used for differential channels (see chapter
on page
0
0
0
0
1
1
1
1
ADC15D
ADC7D
ADC Auto Trigger Source Selections
R/W
R/W
7
0
7
0
281).
ADC14D
ADC6D
R/W
R/W
ADTS1
6
0
6
0
0
0
1
1
0
0
1
1
ADC13D
ATmega640/1280/1281/2560/2561
ADC5D
R/W
R/W
5
0
5
0
ADC12D
ADC4D
R/W
R/W
ADTS0
4
0
4
0
0
1
0
1
0
1
0
1
ADC11D
ADC3D
R/W
R/W
3
0
3
0
Trigger Source
Free Running mode
Analog Comparator
External Interrupt Request 0
Timer/Counter0 Compare Match A
Timer/Counter0 Overflow
Timer/Counter1 Compare Match B
Timer/Counter1 Overflow
Timer/Counter1 Capture Event
ADC10D
ADC2D
R/W
R/W
2
0
2
0
ADC1D
ADC9D
R/W
R/W
1
0
1
0
“Differential Channels”
ADC0D
ADC8D
R/W
R/W
0
0
0
0
.
DIDR0
DIDR2
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