ATmega1281 Atmel Corporation, ATmega1281 Datasheet - Page 77

• 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
Table 13-2
ure 13-5 on page 76
generated internally in the modules having the alternate function.
Table 13-2.
The following subsections shortly describe the alternate functions for each port, and relate the
overriding signals to the alternate function. Refer to the alternate function description for further
details.
Signal Name
DIEOE
DIEOV
PUOE
DDOE
DDOV
PUOV
PVOE
PVOV
PTOE
AIO
DI
summarizes the function of the overriding signals. The pin and port indexes from
Generic Description of Overriding Signals for Alternate Functions
Pull-up Override
Pull-up Override
Override Enable
Override Enable
Override Enable
Enable Override
Enable Override
Override Value
Override Value
Data Direction
Data Direction
Input/Output
Digital Input
Digital Input
Digital Input
Port Toggle
Full Name
Port Value
Port Value
are not shown in the succeeding tables. The overriding signals are
Enable
Enable
Analog
Value
Value
ATmega640/1280/1281/2560/2561
If this signal is set, the pull-up enable is controlled by the PUOV
If this signal is set, the Output Driver Enable is controlled by the
DIEOV signal. If this signal is cleared, the Digital Input Enable is
value is controlled by the PVOV signal. If PVOE is cleared, and
the Output Driver is enabled, the port Value is controlled by the
clock source, the module with the alternate function will use its
This is the Analog Input/output to/from alternate functions. The
This is the Digital Input to alternate functions. In the figure, the
If PVOE is set, the port value is set to PVOV, regardless of the
If PUOE is set, the pull-up is enabled/disabled when PUOV is
before the synchronizer. Unless the Digital Input is used as a
If this signal is set and the Output Driver is enabled, the port
set/cleared, regardless of the setting of the DDxn, PORTxn,
DIEOV is set/cleared, regardless of the MCU state (Normal
If DDOE is set, the Output Driver is enabled/disabled when
signal is connected directly to the pad, and can be used bi-
signal. If this signal is cleared, the pull-up is enabled when
DDOV is set/cleared, regardless of the setting of the DDxn
If this bit is set, the Digital Input Enable is controlled by the
If DIEOE is set, the Digital Input is enabled/disabled when
signal is connected to the output of the schmitt trigger but
DDOV signal. If this signal is cleared, the Output driver is
determined by MCU state (Normal mode, sleep mode).
If PTOE is set, the PORTxn Register bit is inverted.
setting of the PORTxn Register bit.
enabled by the DDxn Register bit.
{DDxn, PORTxn, PUD} = 0b010.
and PUD Register bits.
PORTxn Register bit.
mode, sleep mode).
own synchronizer.
Description
directionally.
Register bit.
Fig-
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