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

I have found many methods to evaluate if a variable is less than zero but I hadn't found any topics here.  Consider

[code]
myValue1 VAR Byte
myValue2 VAR Byte

myValue1=0
myValue2=0

DEC myValue2

IF myValue2 < myValue1 THEN
  'some code
ENDIF
[/code]

I would prefer that the code inside the IF execute however I have not found it to be the case.  The same is true if I substitute 

myValue2=myValue2-1

for

DEC myValue2

My questions:

Can I use a combination of the Carry bit or Digital Carry bit to indicate that a value is less than zero?
Does this depend on CARRYX?
Is there an assembly instruction I could use to evalute the result (S/X B uses CJAE, I believe)?

Joe

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