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AT90PWM2 Datasheet(PDF) 348 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 348 Page - ATMEL Corporation |
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348 / 361 page  348 4317J–AVR–08/10 AT90PWM2/3/2B/3B 32. Errata 32.1 AT90PWM2&3 Rev. A (Mask Revision) • PGM: PSCxRB Fuse • PSC: Prescaler • PSC: PAOCnA and PAOCnB Register Bits (Asynchronous output control) • PSC: PEVxA/B Flag Bits • PSC: Output Polarity in Centered Mode • PSC: Output Activity •VREF •DALI • DAC: Register Update • DAC: Output spikes • DAC driver: Output Voltage linearity • ADC: Conversion accuracy • Analog comparator: Offset value • Analog comparator: Output signal • PSC: Autolock modes • DALI: 17th bit detection • 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. |
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