Subtract from 00 ! - Electronic Circuits Projects Diagrams Free

Suraj143 · 29th October 2009, 05:41 AM

I have a small question. After this code what is the value in W?

Thanks

Code:

	
	movlw	.10
	movwf	Data
	clrf	Reference
	movf	Data,W
	subwf	Reference,W	
	????

Pommie · 29th October 2009, 05:50 AM

It will subtract W from the file and so will do 0-10 = -10 or 246 or 0xf6.

Mike.

Suraj143 · 29th October 2009, 05:56 AM

Quote:

Originally Posted by Pommie

It will subtract W from the file and so will to 0-10 = -10 or 246 or 0xf6.

Mike.

Totally understood.Thanks mike

Mike, K8LH · 29th October 2009, 07:59 AM

Suraj,

I think you'll find that taking the time to learn how to use the MPLAB Simulator and "watch" those file values while single stepping through your code might be a good investment. It certainly was for me...

Kind regards, Mike

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29th October 2009, 05:41 AM	#1
Suraj143	Subtract from 00 ! I have a small question. After this code what is the value in W? Thanks Code: movlw .10 movwf Data clrf Reference movf Data,W subwf Reference,W ????

29th October 2009, 05:50 AM	#2
Pommie	It will subtract W from the file and so will do 0-10 = -10 or 246 or 0xf6. Mike. Last edited by Pommie; 29th October 2009 at 06:01 AM. Reason: typo do was to as quoted below.

29th October 2009, 07:59 AM	#4
Mike, K8LH	Suraj, I think you'll find that taking the time to learn how to use the MPLAB Simulator and "watch" those file values while single stepping through your code might be a good investment. It certainly was for me... Kind regards, Mike