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ATXMEGA128A1-AU Arkusz danych(PDF) 86 Page - ATMEL Corporation

Numer części ATXMEGA128A1-AU
Szczegółowy opis  8/16-bit XMEGA A1 Microcontroller
Download  99 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATXMEGA128A1-AU Arkusz danych(HTML) 86 Page - ATMEL Corporation

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86
8067I–AVR–04/09
XMEGA A1
9.
BOD will be enabled after any reset
If any reset source goes active, the BOD will be enabled and keep the device in reset if the
VCC voltage is below the programmed BOD level. During Power-On Reset, reset will not be
released until VCC is above the programmed BOD level even if the BOD is disabled.
Problem fix/Workaround
Do not set the BOD level higher than VCC even if the BOD is not used.
10. Propagation delay analog Comparator increasing to 2 ms at -40 °C
When the analog comparator is used at temperatures reaching down to -40 °C, the propaga-
tion delay will increase to ~2 ms.
Problem fix/Workaround
None
11. Sampled BOD in Active mode will cause noise when bandgap is used as reference
Using the BOD in sampled mode when the device is running in Active or Idle mode will add
noise on the bandgap reference for ADC and DAC.
Problem fix/Workaround
If the bandgap is used as reference for either the ADC or the DAC, the BOD must not be set
in sampled mode.
12. Default setting for SDRAM refresh period too low
If the SDRAM refresh period is set to a value less then 0x20, the SDRAM content may be
corrupted when accessing through On-Chip Debug sessions.
Problem fix/Workaround
The SDRAM refresh period (REFRESHH/L) should not be set to a value less then 0x20.
13. Flash Power Reduction Mode can not be enabled when entering sleep mode
If Flash Power Reduction Mode is enabled when entering Power-save or Extended Standby
sleep mode, the device will only wake up on every fourth wake-up request.
If Flash Power Reduction Mode is enabled when entering Idle sleep mode, the wake-up time
will vary with up to 16 CPU clock cycles.
Problem fix/Workaround
Disable Flash Power Reduction mode before entering sleep mode.
14. JTAG enable does not override Analog Comparator B output
When JTAG is enabled this will not override the Anlog Comparator B (ACB)ouput, AC0OUT
on pin 7 if this is enabled.
Problem fix/Workaround
AC0OUT for ACB should not be enabled when JTAG is used. Use only analog comparator
output for ACA when JTAG is used, or use the PDI as debug interface.
15. Bandgap measurement with the ADC is non-functional when V
CC is below 2.7V
The ADC cannot be used to do bandgap measurements when V
CC is below 2.7V.


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