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joli

Sum Of Products... Bad Result

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As this old pic is one of many that have the rmw issue (read modify write), i recomend you use the below methode to change

ports:

unsigned char portb_mirror = 0xfe;

portb = portb_mirror;

instead of: portb = 0xfe;

 

Please explain why your method is more preferable?

 

Regards,

Pavel

 

In the particular case where he just write the entire port and he do nothing more, its irrelevant the use of a port shadow.

I point it just a general rule to follow just in case.

 

Actually in some load circumstancies pic12/16/18 all them have this issue, the difference is that the pic18 and new pic16 have the lat(x).

 

google for "microchip DS31009A" pag 9

 

br

 

 

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