ATmega1281 Atmel Corporation, ATmega1281 Datasheet - Page 380

• 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

Table 31-12. External Data Memory Characteristics, 4.5 to 5.5 Volts, 1 Cycle Wait-state
Table 31-13. External Data Memory Characteristics, 4.5 to 5.5 Volts, SRWn1 = 1, SRWn0 = 0
Table 31-14. External Data Memory Characteristics, 4.5 to 5.5 Volts, SRWn1 = 1, SRWn0 = 1
Table 31-15. External Data Memory Characteristics, 2.7 to 5.5 Volts, No Wait-state
2549N–AVR–05/11
0
10
12
15
16
0
10
12
15
16
0
10
12
14
15
16
0
Symbol
1/t
t
t
t
t
1/t
t
t
t
t
Symbol
1/t
t
t
t
t
t
Symbol
1/t
RLDV
RLRH
DVWH
WLWH
RLDV
RLRH
DVWH
WLWH
RLDV
RLRH
WHDX
DVWH
WLWH
Symbol
CLCL
CLCL
CLCL
CLCL
Parameter
Oscillator Frequency
Read Low to Data Valid
RD Pulse Width
Data Valid to WR High
WR Pulse Width
Parameter
Oscillator Frequency
Read Low to Data Valid
RD Pulse Width
Data Valid to WR High
WR Pulse Width
Parameter
Oscillator Frequency
Read Low to Data Valid
RD Pulse Width
Data Hold After WR High
Data Valid to WR High
WR Pulse Width
Parameter
Oscillator Frequency
Min
240
240
240
Min
365
375
365
Min
365
240
375
365
Min
8MHz Oscillator
4MHz Oscillator
4MHz Oscillator
4MHz Oscillator
ATmega640/1280/1281/2560/2561
Max
Max
Max
Max
200
325
325
2.0t
2.0t
3.0t
3.0t
3.0t
2.0t
3.0t
2.0t
3.0t
3.0t
Min
Min
Min
Min
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
0.0
0.0
0.0
0.0
Variable Oscillator
Variable Oscillator
Variable Oscillator
Variable Oscillator
CLCL
CLCL
CLCL
-10
-10
-10
-10
-10
-10
-10
2.0t
3.0t
3.0t
Max
Max
Max
Max
CLCL
CLCL
CLCL
16
16
16
8
-50
-50
-50
MHz
Unit
Unit
ns
Unit
MHz
MHz
MHz
Unit
ns
ns
380