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'EPROM based PIC serial programming'
1998\05\07@072303 by Zoltan Perhacs

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Can i program the EPROM based PIC microcontrollers with serial mode
programming ?
Is the serial mode programming just for the OTP and FLASH PICs ?

1998\05\07@194153 by Mike Keitz

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On Thu, 7 May 1998 13:20:48 +0200 Zoltan Perhacs <spam_OUTpzoltanTakeThisOuTspamUSA.NET>
writes:
>Can i program the EPROM based PIC microcontrollers with serial mode
>programming ?
>Is the serial mode programming just for the OTP and FLASH PICs ?

Most of the PIC line is EPROM based.  An OTP PIC is just an EPROM PIC in
a black plastic package that can't be erased.  It is *exactly* the same
chip found in the "JW" ceramic package with a window so it can be erased.

So any circuit that can program an OTP chip can also program a JW window
version of the same chip.  The main thing to look out for with homemade
programmers is that the 16F84 "Flash" chips aren't too particular about
the high voltage applied to the MCLR pin to program them.  The actual
programming voltage comes from an internal voltage multiplier.  But the
EPROM chips are sensitive to the MCLR voltage, since this voltage is used
directly to program the EPROM array.  A programmer for them needs to
apply a well-regulated voltage with about 50 mA current capability.  Also
the '84s internally time the programming cycle but the EPROM ones don't.
(The voltage booster and internal timer need to be present in the 16X84
to support the data EEPROM during run-time.)  That's why so many of the
homemade programmers are only suitable for the '84s.


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