In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eMAN wrote:

[color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Hello,[/color]



[color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Ran into a question that has me puzzled...[/color]



[color=#996600]<SPAN style="FONT-SIZE: 10pt; COLOR: #996600"> [/color]



[color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">I have a program developed for the SX52 (will be a 48 in production) which compares two 8 bit numbers.  One number is declared a byte the other is a word. [/color]



[color=#996600]<SPAN style="FONT-SIZE: 10pt; COLOR: #996600"> [see attached "vars"][/color]



[color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">[/color]



[color=#996600]<SPAN style="FONT-SIZE: 10pt; COLOR: #996600"> [/color][color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">When I code the IF statement I use the _LSB of the word to compare with the byte variable.  Needless to say, the code does not work correctly.  The compare fails when the debugger shows me that the subtract yields a 0 and the zero flag is set.[/color]



[color=#996600]<SPAN style="FONT-SIZE: 10pt; COLOR: #996600"> [see attached "Debugger screen"][/color]



[color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">The generated code (I'm not an expert in SX .. .yet) seems to be weird.  The SNZ instruction is followed by a page instruction then a jump.  It would appear that the code will not operate correctly.[/color]



[color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Can you help me understand this?[/color]

[color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">[/color] 

[color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Using: IDE 3.2.3, SASM 1.51.07, SXB 1.51.03, SXSim 2.08.05[/color]



[color=#996600]<SPAN style="FONT-SIZE: 10pt; COLOR: #996600"> [/color]



[color=black]<SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Thanks for your help,[/color]


[color=#996600]<SPAN style="FONT-SIZE: 10pt; COLOR: #996600; FONT-FAMILY: Arial">_______________________________[/color]

[color=#996600]<SPAN style="FONT-SIZE: 10pt; COLOR: #996600; FONT-FAMILY: Arial">Don Gille[/color]

[color=#996600]<SPAN style="FONT-SIZE: 10pt; COLOR: #996600"> [/color]

[color=#996600]<SPAN style="FONT-SIZE: 10pt; COLOR: #996600">[/color]

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