> 04 Sep 96, Alexej Vladimirov writes to Nikolai Zaharugin :

 > The main difference between development programmers
 > (PICSTART+, COMPIC-1/5X and many others) and production
 > quality programmers (PROMATE-II, COMPIC-PRO and also some
 > others) is variable Vdd and Vpp during programming and
 > verification.

 >
 > As noted at Microchip's programming specifications, for
 > production quality programmers Vdd should be varied from 2.0
 > till 6.5V with 0.25V granularity (DS30190D, p.3), Vpp should
 > be varied from 12 till 14V with 0.25V granularity (DS30337A,
 > p.1).
 >
 > The main reason for variable Vdd is the following: Vdd in
 > the real device can be different, than during
 > programming/verification.

 Yes, I'm agree, but what is the reason to use variable Vpp ?

-------------------------------
   Best Wishes, Alex Torres.
   Kharkov, Ukraine, exUSSR.
   E-Mail To : altor@cook.kharkov.ua   via InterNet
               or 2:461/28             via FidoNet

---  GoldED 2.50.A0531+
* PICLAB->Semi-Production-Quality Programmer
* for 16Cxx,24xx,93xx - OK.
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