On Sat, Aug 24, 2002 at 08:02:31PM -0400, Olin Lathrop wrote:
> > ... But the TLVP is a low voltage programmer.
>
> Could the original poster have a code protected chip?

So? Code protection can be set and reset in LVP mode. Bulk erase is available
down to a Vcc of 4.5 volts. The Vcc in the TLVP programmer is the standard 5V.
Only the mechanism for indicating programming mode has changed.

The only bit that cannot be changed in low voltage mode (from 4.5-5.5V)is the
LVP bit. Makes sense don'tcha think?

>
> Frankly, low voltage programmers are evil and should be banned to beginners.

They are certainly not evil. They present tradeoffs in terms of simplicity
(i.e. not having multiple switched voltages for the programmer) vs. consumed
resources (the dedicated I/O pin for PGM.) vs. a small bit of extra complexity
(i.e. remembering to ground the PGM pin in circuit.)

BAJ

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