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'Teaching your PIC programmer new tricks?'
1995\08\03@131218 by Byron A Jeff

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>
> Ok now, this RS-232 powered C84
> programmer that everyone has been
> talking about sounds great!!  But I need to
> program a C6X or C7X.  Can someone
> guide me to a simple circuit for
> programming these from a RS-232 port.
> Or please tell me that for your next trick
> you PIC gurus are going to design a
> RS-232 powered programmer for these.
> ;-)  Thanks.
>

It's not an issue of power. The problem is that the 8X is unique because
it uses EEPROM not EPROM. EEPROM in the 8X series is self timed for
writing so all that has to be issued is a start program command. The 6X and
7X need both start and stop commands with 100 uS +- 5 uS interval inbetween.

Hard to do with standard PC.

You'll probably have to bootstrap a programmer using a 16C84 which can
generate pulses that precise.

This is becoming a FAQ because this is the second time I've posted this
info in less than a week.

BAJ

1995\08\03@151326 by Derrick Early

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> It's not an issue of power. The problem is that the 8X is unique because
> it uses EEPROM not EPROM. EEPROM in the 8X series is self timed for
> writing so all that has to be issued is a start program command. The 6X and
> 7X need both start and stop commands with 100 uS +- 5 uS interval inbetween.
>
> Hard to do with standard PC.

It can be done on a pc.  You just have to code some bench mark routines
to set up an accurate delay routine.  If you use some hi resolution timer
routines, you can look at the pc clock down at the us level.

--
Derrick Early
spam_OUTearlyTakeThisOuTspamfinite.nrl.navy.mil

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