How can I add 16 bit value ?

Status
Not open for further replies.
B

bianchi77

Advanced Member level 4
Joined
Jun 11, 2009
Messages
1,313
Helped
21
Reputation
44
Reaction score
20
Trophy points
1,318
Location
California
Visit site
Activity points
9,442
Guys, How can I add 16 bits value into the memory,

I have :

Code: 
LedTimer  RES 2

movlw .255
movwf  LedTimer

how can I enter .300 into LedTimer ?
Is it splitted into .150 ?

Thanks
 

You can't, at least not without a 16-bit processor. It is possible to refer to it in two 8-bit locations but it gets complicated, a better solution is to use two variables, like this:

LedTimerH RES 1
LedTimerL RES 1

movlw .255
movwf LedTimerH
movlw .45
movwf LedTimerL

You can leave RES out if you like, it defaults to 1 unless you tell it otherwise.

Brian.
 

how can I reduce them ?

Code: 
counter
		 Global 	counter			;Decrementing Sec's  
	 BANKSEL 	LedTimerH		;timer value
    	 movf 	    LedTimerH,w		;for every counts
    	 btfss 	    STATUS,Z
         decf   	LedTimerH,f

          BANKSEL 	LedTimerL		;timer value
    	 movf 	    LedTimerL,w		;for every counts
    	 btfss 	    STATUS,Z
         decf   	LedTimerL,f
		 return

- - - Updated - - -

can I do like this ?

Code: 
Would it be like this ?
               movlw LOW .300
                movwf LedTimer
                movlw HIGH .300
                movwf LedTimer+1

counter
         Global     counter            ;Decrementing Sec's 
         BANKSEL     LedTimer        ;timer value
         movf         LedTimer,w        ;for every counts
         btfss         STATUS,Z
         decf       LedTimer,f
        
         movf         LedTimer+1,w        ;for every counts
         btfss         STATUS,Z
         decf       LedTimer+1,f
         return
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…