8. ADC measurement reports abnormal values with PSC2-synchronized conver-
sions
When using ADC in synchronized mode, an unexpected extra Single ended conversion
can spuriously re-start. This can occur when the End of conversion and the Trigger
event occur at the same time.
Workaround
No workaround
9. ADC amplifier measurement is unstable
When switching from a single-ended ADC channel to an amplified channel, noise can
appear on the next ADC conversion.
Workaround
After switching from a single ended to an amplified channel, discard the first ADC
conversion.
10. PSC emulation
In emulation mode, TCNTn, OCRnx and ICRn 16-bit registers are accessed via the
TEMP register. This can induce an execution error, in step by step mode due to TEMP
register corruption.
Workaround
No workaround
11. Read / Write instructions of MUXn and REFS1:0 bits in the ADMUX Register dur-
ing Analog conversion
During Analog conversion, the set or clear instructions of ADMUX channel and refer-
ence selection bits will fail.The bits of the temporary buffer will be written in place of the
final bits.
Workaround
Wait for the end of ADC conversion before any write of new channel or reference selec-
tion values in ADMUX.
22
Atmel ATmega16/32/64/M1/C1
7647ES–AVR–07/12
ATMEL [ ATMEL ]
