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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


unsigned char portb_mirror = 0xfe;

portb = portb_mirror;

instead of: portb = 0xfe;


Please explain why your method is more preferable?





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





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