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ATMEGA1281-16MUR 데이터시트(PDF) 32 Page - ATMEL Corporation

부품명 ATMEGA1281-16MUR
상세설명  8-bit Atmel Microcontroller with 16/32/64KB In-System Programmable Flash
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA1281-16MUR 데이터시트(HTML) 32 Page - ATMEL Corporation

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [SUMMARY]
2549QS–AVR–02/2014
11.18 ATmega2561 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 max-
imum 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.
Problem Fix/Workaround
There are two application workarounds, where selecting one of them, will be omitting the issue:
- Replace IN and OUT with LD/LDS/LDD and ST/STS/STD instructions.


유사한 부품 번호 - ATMEGA1281-16MUR

제조업체부품명데이터시트상세설명
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ATMEL Corporation
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유사한 설명 - ATMEGA1281-16MUR

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