Problem with the NOT operator and byte variables ?

[Jacques Nilo]

I am running into a problem using the NOT/! operator with byte variables. The program is as follows:

one=1
zero=0
wait 1 s
HSerPrint "one and (not zero)"
HSerPrintCRLF
hserprint one & (!zero)
HSerPrintCRLF
HSerPrint "one or (not one)"
HSerPrintCRLF
HSerPrint one | (!one)
HSerPrintCRLF
HSerPrint "one xor (not one)"
HSerPrintCRLF
HSerPrint one # (!one)
HSerPrintCRLF
HSerPrint "not one"
HSerPrintCRLF
HSerPrint !one
HSerPrintCRLF
HSerPrint "not zero"
HSerPrintCRLF
HSerPrint !zero

When one and zero variables are declared as bits the results of logical operations are ok even though !one and !zero show up as 254 and 255:

one and (not zero)
1
one or (not one)
1
one xor (not one)
0
not one
254                    <---- ????
not zero
255                    <---- ????

When one and zero variables are declared as byte (default) some of the results of the same logical operations are wrong:

one and (not zero)
1
one or (not one)        
255                    <---- Wrong
one xor (not one)
255                    <---- Wrong
not one
254
not zero
255

Does it mean that the NOT operator cannot be used as a logical operator on byte variables (AND, OR, XOR are working ok on both bit & byte variables) ?
Jacques

[Anobium]

Can you confirm your microprocessor type?

Thank you.

[Jacques Nilo]

16F690

[Anobium]

I had the same question a year or so ago. I just cannot find Hugh's response but I was convinced by the response re the treatment of operators.

However, something is not right. I am getting the same results as you on PIC but different results on AVR.

@Hugh. Your view please.