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4317IS–AVR–01/08

AT90PWM2/3/2B/3B

9.

Errata

9.1

AT90PWM2&3 Rev. A (Mask Revision)

•

PGM: PSCxRB Fuse

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PSC: Prescaler

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PSC: PAOCnA and PAOCnB Register Bits (Asynchronous output control)

•

PSC: PEVxA/B Flag Bits

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PSC: Output Polarity in Centered Mode

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PSC: Output Activity

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VREF

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DALI

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DAC: Register Update

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DAC: Output spikes

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DAC driver: Output Voltage linearity

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ADC: Conversion accuracy

•

Analog comparator: Offset value

•

Analog comparator: Output signal

•

PSC: Autolock modes

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DALI: 17th bit detection

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PSC: One ramp mode with PSC input mode 8

1.

PGM: PSCnRB Fuse

The use of PSCnRB fuse can make the parallel ISP fail.

Workaround:

When PSCnRB fuses are used, use the serial programming mode to load a new program

version.

2.

PSC: Prescaler

The use of PSC's prescaler have the following effects :

It blocks the sample of PSC inputs until the two first cycles following the set of PSC run bit.

A fault is not properly transferred to other (slave) PSC.

Workaround:

Clear the prescaler PPREx bit when stopping the PSC (prun = 0), and set them to appropri-

ate value when starting the PSC (prun = 1), these bits are in the same PCTL register

Do not use the prescaler when a fault on one PSC should affect other PSC’s

3.

PSC: PAOCnA and PAOCnB Register Bits (Asynchronous output control)

These register bits are malfunctioning.

Workaround:

Do not use this feature.

4.

PSC: PEVnA/B flag bits

These flags are set when a fault arises, but can also be set again during the fault itself.

Workaround:

Don't clear these flags before the fault disappears.