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'In-system serial programming (?)'
1995\06\02@210632 by Albert J. Fahey

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Admittedly I am still figuring things out here ... but let
me ask this question ... Why is David Tait's 16C84 programmer
only labeled as for 16C84's?  Other PIC's have in-system serial
programming!  Isn't it just a question of software?

Why couldn't I use David Tait's programmer to program a
16C74?

Albert

1995\06\02@212338 by Byron A Jeff

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>
> Admittedly I am still figuring things out here ... but let
> me ask this question ... Why is David Tait's 16C84 programmer
> only labeled as for 16C84's?  Other PIC's have in-system serial
> programming!  Isn't it just a question of software?
>
> Why couldn't I use David Tait's programmer to program a
> 16C74?


One word: EEPROM

See the 16C84 EEPROM is self timed on the write. So once you send a
begin programming command it'll stop programming automatically.

All the other parts however use EPROM. So the programmer is obligated to
send a STOP programming in addition to the BEGIN program command. I believe
that the time is only 100 uS pulses which is difficult to get with any
accuracy in software.

Best bet would be a 16C84 that would handle the task easily. It can be self
programmed and then the programm driven by a 16C84 could programm all
the other parts.

Later,

BAJ

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