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how difference between PIC16F877(-20) and PIC16F877A?
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pops999



Joined: 08 Sep 2004
Posts: 27
Post20 Dec 2004 8:42   

difference between pic16f877 and pic16f877a
i dont understand.
PIC16F877A is better PIC16F877(-20)?
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IanP



Joined: 05 Oct 2004
Posts: 6492
Helped: 1542
Location: West Coast
Post20 Dec 2004 8:56   

pic16f877-20
PIC16F877A has analog comparators. On reset they are turned off but the pins are configured as analog inputs. The A model won't act pin compatible with the older PIC16F877 until the software changes the pins back to digital inputs.

There is a separate MicroChip programming spec for the A version which has different flow chart algorithms compared to the 16F877 specification.

And there are more differencies.
So it looks like you can not directly replace older 877 with the "improved" 877A..
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Post20 Dec 2004 8:56   

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M!k



Joined: 22 Apr 2002
Posts: 871
Helped: 79
Post20 Dec 2004 10:42   

flowchart examples for pic 16f877
download the migration note from Microchip:
PIC16F87X to PIC16F87XA Migration
http://ww1.microchip.com/downloads/en/DeviceDoc/39591a.pdf


Mik
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