ATXMEGA64A1-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATXMEGA64A1-CU

8/16-bit XMEGA A1 Microcontroller

Atmel Corporation 

XMEGA A1

9. EEPROM erase and write does not work with all System Clock sources

When doing EEPROM erase or Write operations with other clock sources than the 2 MHz

RCOSC, Flash will be read wrongly for one or two clock cycles at the end of the EEPROM

operation.

Problem fix/Workaround

Alt 1: Use the internal 2 MHz RCOSC when doing erase or write operations on EEPROM.

Alt 2: Ensure to be in sleep mode while completing erase or write on EEPROM. After starting

erase or write operations on EEPROM, other interrupts should be disabled and the device

put to sleep.

10. 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.

11. 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

12. 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.

13. 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.

14. 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.

96

8067L–AVR–08/10

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