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ATMEGA1280V データシート(PDF) 32 Page - ATMEL Corporation

部品番号 ATMEGA1280V
部品情報  8-bit Atmel Microcontroller with 64K 128K 256K Bytes In-System Programmable Flash
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA1280V データシート(HTML) 32 Page - ATMEL Corporation

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2549PS–AVR–10/2012
ATmega640/1280/1281/2560/2561
11.12 ATmega2560 rev. A
Non-Read-While-Write area of flash not functional
Part does not work under 2.4 volts
Incorrect ADC reading in differential mode
Internal ADC reference has too low value
IN/OUT instructions may be executed twice when Stack is in external RAM
EEPROM read from application code does not work in Lock Bit Mode 3
1.
Non-Read-While-Write area of flash not functional
The Non-Read-While-Write area of the flash is not working as expected. The problem is
related to the speed of the part when reading the flash of this area.
Problem Fix/Workaround
- Only use the first 248K of the flash.
- If boot functionality is needed, run the code in the Non-Read-While-Write area at maximum
1/4th of the maximum frequency of the device at any given voltage. This is done by writing
the CLKPR register before entering the boot section of the code.
2.
Part does not work under 2.4 volts
The part does not execute code correctly below 2.4 volts.
Problem Fix/Workaround
Do not use the part at voltages below 2.4 volts.
3.
Incorrect ADC reading in differential mode
The ADC has high noise in differential mode. It can give up to 7 LSB error.
Problem Fix/Workaround
Use only the 7 MSB of the result when using the ADC in differential mode.
4.
Internal ADC reference has too low value
The internal ADC reference has a value lower than specified.
Problem Fix/Workaround
- Use AVCC or external reference.
- The actual value of the reference can be measured by applying a known voltage to the
ADC when using the internal reference. The result when doing later conversions can then be
calibrated.
5.
IN/OUT instructions may be executed twice when Stack is in external RAM
If either an IN or an OUT instruction is executed directly before an interrupt occurs and the
stack pointer is located in external ram, the instruction will be executed twice. In some cases
this will cause a problem, for example:
- If reading SREG it will appear that the I-flag is cleared.
- If writing to the PIN registers, the port will toggle twice.
- If reading registers with interrupt flags, the flags will appear to be cleared.


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同様の説明 - ATMEGA1280V

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