ATXMEGA8E5 datasheet(145/153 Pages) MICROCHIP

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Data Sheet Complete

DS40002059A-page 145

ATxmega32E5/16E5/8E5

38.2 Rev. A

• DAC: AREF on PD0 is not available for the DAC

• EDMA: Channel transfer never stops when double buffering is enabled on sub-sequent channels

• ADC: Offset correction fails in unsigned mode

• ADC: Averaging is failing when channel scan is enabled

• ADC: Averaging in single conversion requires multiple conversion triggers

• ADC accumulator sign extends the result in unsigned mode averaging

• ADC: Free running average mode issue

• ADC: Event triggered conversion in averaging mode

• AC: Flag can not be cleared if the module is not enabled

• USART: Receiver not functional when variable data length and start frame detector are enabled

• T/C: Counter does not start when CLKSEL is written

• EEPROM write and Flash write operations fails under 2.0V

• TWI master or slave remembering data

• Temperature Sensor not calibrated

Issue:

DAC: AREF on PD0 is not available for the DAC

The AREF external reference input on pin PD0 is not available for the DAC.

Workaround:

No workaround. Only AREF on pin PA0 can be used as external reference input for the DAC.

Issue:

EDMA: Channel transfer never stops when double buffering is enabled on sub-sequent channels

When the double buffering is enabled on two channels, the channels which are not set in double buffering mode are

never disabled at the end of the transfer. A new transfer can start if the channel is not disabled by software.

Workaround:

• CHMODE = 00

Enable double buffering on all channels or do not use channels which are not set the double buffering mode.

• CHMODE = 01 or 10

Do not use the channel which is not supporting the double buffering mode.

Issue:

ADC: Offset correction fails in unsigned mode

In single ended, unsigned mode, a problem appears in low saturation (zero) when the offset correction is activated.

The offset is removed from result and when a negative result appears, the result is not correct.

Workaround:

No workaround, but avoid using this correction method to cancel

V effect.

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