[elektro] Fw: Microchip MPLAB, PIC18F8720 gondok

[flaist]

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.