at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 310

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

29.5
310
Errata AT90PWM81 revE
AT90PWM81
•
•
•
4. Flash and EEPROM programming failure if CPU clock is switched
5. ADC AMPlifier measurement is unstable
6. ADC measurement reports abnormal values with PSC2-synchronized
7. Over-consumption in power down sleep mode.
1. Clock Switch enable & disable
If Clock switching is used in the Application, the memory programming is only possible when
the internal RC oscillator is selected as System clock.
If the Application requires a memory programming on a clock source different from the inter-
nal RC oscillator, do not switch to this clock source.
Work around:
- Use internal RC oscillator when programming Flash and EEPROM,
or
- Do not use clock switching
When switching from a single-ended ADC channel to an Amplified channel, noise can
appear on ADC conversion.
Work around:
After switching from a single ended to an amplified channel, discard the first ADC
conversion.
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.
Work around:
No workaround
In Power-down mode, an extra power consumption up to 500µA may occur.
Work around:
No workaround
Clock Switch disable
Crystal oscillator control with Clock Switch
BOD disable fuse
After a “Enable Clock Source” or a “Disable Clock Source” command, the command is still
active until the next access of CLKCSR register. If CLKSEL is written with a new value, the
corresponding clock will be unintentionnaly enabled or disabled.
Work around:
Atter the Enable or Disable command, write CLKCSR with value 1<<CLKCCE
conversions
7734M–AVR–03/10