[elektro] Fw: Microchip MPLAB, PIC18F8720 gondok

[charles hoss]

b+...
ez az errata nem gyenge .
nem csodalom hogy kidobtatok .

bye
dexter



2013/7/17 flaist <flaist at gmail.com>

> Szia!
> Na ez a proc. volt ami kiverte nálam anno a biztit.
> Sokáig nem tudtam mi okozza, de ezek a kütyük a legkisebb elektromos
> zavarra
> (lámpa ki/be kapcsolás) elszálltak.
> Aztán megleltük az alábbi ERRATA-t.
> Rögtön összes kiforraszt, PIC18F6722-re csere és a jelenség megszűnt.
>
>
> PIC18F6620/8620/6720/8720 Rev. A3 Silicon/Data Sheet Errata
>
> 1. Module: Core
> Certain code sequence and placement may cause
> the corruption of a few bits in the instruction fetch
> when the part is used above 4 MHz. A corrupted
> instruction fetch will cause the part to execute an
> improper instruction and result in unpredictable
> outputs.
> Microchip cannot predict which code sequences
> and placement will cause this failure. If this failure
> mechanism exists in your system, it should be
> evident during statistically significant pre-
> production testing (minimum suggested sample
> size: 100 units) of your particular code sequence
> and placement.
> Any code changes should be tested in the same
> manner prior to their implementation. If most parts
> fail your tests, or if failures are seen at all voltages
> or at all frequencies, this indicates that the problem
> experienced does not relate to this failure
> mechanism.
> This problem has not been observed at operating
> frequencies below 4 MHz.
> Work around
> Use the part at or below 4 MHz.
> Date Codes that pertain to this issue:
> This problem is specific to Rev. A3 silicon and has
> been resolved by Rev. A4 (devices with date code
> 0421 or later) of the silicon.
>
>
>
>
> -----Original Message-----
> From: elektro-bounces at tesla.hu [mailto:elektro-bounces at tesla.hu] On Behalf
> Of "János, Zakó"
> Sent: Tuesday, July 16, 2013 3:28 PM
> To: elektro at tesla.hu
> Subject: Re: [elektro] Fw: Microchip MPLAB, PIC18F8720 gondok
>
> Ebből nem tudom melyik rész vezet  a megoldáshoz, de egy Chipcad-es másfél
> órás telefonálás után nem sokkal vagyok előrébb. Annyi kiderült, hogy egy
> PIC18F4620-al is megvan ez a hibaüzenet, IPE szoftverrel is.
>
> -----------------------------------------
>           elektro[-flame|-etc]
>