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'[PIC]: f877 flash programming'
2002\02\27@144514 by uter van ooijen & floortje hanneman

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Reading through the In Circuit Serial Programming document I found that the
max program time for the modern flash chips (f62x, f87x) is 5 ms instead of
the 10 ms for the older chips (16x84). Nice, I can make my programmer
faster. But there is also a typical programming type of 2 ms. What is the
use of that spec? I am not aware of a way to check that the cycle is
finished, so I will have to wait the worst case 5 ms, or am I missing
something.

Another programming question: the document shows ID word values. Are these
values
- flash (writeable) or read-only
- if writeable: must they be set to the listed value or are they just there
for a programmer to detect trhe type of chip?

Wouter van Ooijen
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2002\02\27@172400 by Tony Nixon

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wouter van ooijen & floortje hanneman wrote:
>
> Reading through the In Circuit Serial Programming document I found that the
> max program time for the modern flash chips (f62x, f87x) is 5 ms instead of
> the 10 ms for the older chips (16x84). Nice, I can make my programmer
> faster. But there is also a typical programming type of 2 ms. What is the
> use of that spec? I am not aware of a way to check that the cycle is
> finished, so I will have to wait the worst case 5 ms, or am I missing
> something.

I guess because you cannot determine if programming has completed stick
with the worst case 5mS.

> Another programming question: the document shows ID word values. Are these
> values
> - flash (writeable) or read-only
> - if writeable: must they be set to the listed value or are they just there
> for a programmer to detect trhe type of chip?

I'm unsure if these locations are writable, although I wouldn't think
so. They are there when you first read a new chip. I use them in my
Windows programmer and the Fobbit to check that the correct chip is
inserted.

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Tony

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