ATmega1281 Atmel Corporation, ATmega1281 Datasheet - Page 228

• 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 22-9.
2549N–AVR–05/11
Max.
115.2K
230.4K
57.6K
76.8K
Baud
(bps)
250K
Rate
(1)
UBRR
0
–
–
–
–
Examples of UBRRn Settings for Commonly Used Oscillator Frequencies (Continued)
U2Xn = 0
62.5Kbps
f
osc
Error
8.5%
–
–
–
–
= 1.0000MHz
Note:
UBRR
1
1
0
–
–
U2Xn = 1
125Kbps
1. UBRR = 0, Error = 0.0%
-18.6%
Error
8.5%
8.5%
–
–
UBRR
1
1
0
–
–
115.2Kbps
U2Xn = 0
f
-25.0%
ATmega640/1280/1281/2560/2561
osc
Error
0.0%
0.0%
–
–
= 1.8432MHz
UBRR
1
3
2
0
–
230.4Kbps
U2Xn = 1
Error
0.0%
0.0%
0.0%
0.0%
–
UBRR
1
1
0
–
–
U2Xn = 0
125Kbps
f
-18.6%
osc
Error
8.5%
8.5%
–
–
= 2.0000MHz
UBRR
3
2
1
–
0
U2Xn = 1
250Kbps
Error
8.5%
8.5%
8.5%
0.0%
–
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