On 10-09-22 08:16 AM, David Duffy (AVD) wrote:
> Rolf wrote:
>   =20
>> Good point. All writes to PORTx are written to the latch anyway, so clrf
>> PORTx is identical to clrf LATx
>>
>> The port pin diagrams indicate that fact as well.
>>
>> Further, all analog pins read as '0', all digital pins read the state of
>> the signal (which for outputs may be a mis-match to the LATx value if
>> you have slow-changing signal lines...).
>>
>> But, in all cases, clrf PORTx =3D=3D clrf LATx
>>
>> On the other hand, it's not an error to do it twice... and further,
>> operations other than 'clrf' on PORTx will/may produce a different
>> result than the same operation on LATx... so perhaps it is good practice
>> to treat them 'both' explicitly in the initialization routine...
>>
>>     =20
> Sorry, you're confusing me now!  How would MOVWF PORTx and MOVWF LATx
> ever end in a different result?
> David...
>   =20
Well, movwf is not a great example, but how about movf, bsf, or incf, etc.

When I said 'operations other than clrf' I did not mean *every* other=20
operation other than clrf... just 'at least some'.

Rolf
--=20
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