16f877 vs 16f887 ??

[asmboy]

why do questions keep cropping up re: the 877 ??

it is clearly and totally replaced in all functions by the F887 and for
1/3 the $$ cost

i have several hundred 877a's in old -"new" stock that i use in a legacy project, but only because they are already paid for.

why would anyone design in an 877 NOW??
and why do ?? keep showing up about it ??

[PCM programmer]

Proteus simulation.

[temtronic]

Also...
could be school projects ? Prof can't be bothered to 'update' the course as he'd have to change his notes ?
If this is the case it sets the students up to fail in the real world which is really sad.

I too, have a drawer full of 'obsolete' PICs...16C84, 16C71, 16F877. Kinda neat to see the innards of one through the quartz window though !

jay

[jeremiah]

Also could be due to procurement rules for a particular job. Not all employers see the value in "changing something that always worked before" even though the new solution is clearly better. Sometimes part changes require a re-certification process of certain systems (if the certification is tied to the part itself rather than the board as a whole). Also some places have an amazingly obtuse and long purchasing process, so using an instock part is much much faster means of getting a project done.

I know for my ownself, the difference in choosing a part in our own stock versus ordering a new part is 1 day vs 3 months. I still choose the latter when I can, but I don't always have the timetable to buy new parts. I just try to sneak them in when I can.

I don't use the 877 (I actually stick to PIC24's when I can), but I definitely understand the pain of being stuck having to use an old old part.

[Gabriel]

I think maybe 1/10 posts here with 877A's are by Pros.

In reality i just think its the standard for courses because there is so much info on the web for students to find and as mentioned before, nobody has updated said courses.

Also cost is not an issue i believe, since in a Class you will be required to have 1 or 2 chips... if its under 10 bucks nobody will think twice to go against the recommended chip.

Also if you find a driver for a 877A' you basically know you will be able to get it to work with whatever chip you are using...
_________________
CCS PCM 5.078 & CCS PCH 5.093

[asmboy]

i should add that the 18f46k80 is the descendant-compatible part
i tend to gravitate toward now.
very lovely bit of silicon IMHO

and it too is only 2/3 the $$ of an f877 for 12 bits of ADC and all
that prog and stat memory..........

[PCM programmer]

That PIC won't work with PicKit 2. So for students and teachers that
have somewhat older equipment, a class worth of equipment, it's not
worth it to use new PICs.