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ATMEGA128-16MI 데이터시트(PDF) 18 Page - ATMEL Corporation

부품명 ATMEGA128-16MI
상세설명  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

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18
ATmega128
2467OS–AVR–10/06
4.
Stabilizing time needed when changing OSCCAL Register
After increasing the source clock frequency more than 2% with settings in the OSC-
CAL register, the device may execute some of the subsequent instructions
incorrectly.
Problem Fix / Workaround
The behavior follows errata number 1., and the same Fix / Workaround is applicable
on this errata.
5.
IDCODE masks data from TDI input
The JTAG instruction IDCODE is not working correctly. Data to succeeding devices
are replaced by all-ones during Update-DR.
Problem Fix / Workaround
If ATmega128 is the only device in the scan chain, the problem is not visible.
Select the Device ID Register of the ATmega128 by issuing the IDCODE
instruction or by entering the Test-Logic-Reset state of the TAP controller to
read out the contents of its Device ID Register and possibly data from
succeeding devices of the scan chain. Issue the BYPASS instruction to the
ATmega128 while reading the Device ID Registers of preceding devices of
the boundary scan chain.
If the Device IDs of all devices in the boundary scan chain must be captured
simultaneously, the ATmega128 must be the fist device in the chain.
ATmega128 Rev. L
First Analog Comparator conversion may be delayed
Interrupts may be lost when writing the timer registers in the asynchronous timer
Stabilizing time needed when changing XDIV Register
Stabilizing time needed when changing OSCCAL Register
IDCODE masks data from TDI input
1.
First Analog Comparator conversion may be delayed
If the device is powered by a slow rising V
CC, the first Analog Comparator conver-
sion will take longer than expected on some devices.
Problem Fix/Workaround
When the device has been powered or reset, disable then enable theAnalog Com-
parator before the first conversion.
2.
Interrupts may be lost when writing the timer registers in the asynchronous
timer
If one of the timer registers which is synchronized to the asynchronous timer2 clock
is written in the cycle before a overflow interrupt occurs, the interrupt may be lost.
Problem Fix/Workaround
Always check that the Timer2 Timer/Counter register, TCNT2, does not have the
value 0xFF before writing the Timer2 Control Register, TCCR2, or Output Compare
Register, OCR2
3.
Stabilizing time needed when changing XDIV Register
After increasing the source clock frequency more than 2% with settings in the XDIV
register, the device may execute some of the subsequent instructions incorrectly.


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