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

I have port rc set to output to leds, and port ra is hooked up to switches. I expect the code to wait until rb.1 is activated.  Then I want the information from rb put into location 12, and I want bits 7 to 4 cleared. Then I want this outputed to rc. If I remove the xor line it works except that bits 7 to 4 need to be cleared. However when I have the xor statement, bits 7 to 4 are cleared, and 3 to 0 are set. I was hoping someone could tell me where I'm going wrong. The final code I'm trying to write, will take bits 0 to 3 and then activate an external chip select on ra.0 and then move bits rb.5 to location $12.5, rb8 to location $12.6.


[code]
		mov	W,#$1F			;Allow Direction configuration
		mov	M,W
		mov	!rb,#%11111111		;Set port B bits 0-7 to input
		mov	!ra,#%00000000		;Set port A bits 0-7 output bit 0 is select
		mov	!rc,#%00000000		;Set port C bits 0-7 output
bwait 		jnb 	rb.1,bp0	
		jmp 	bwait			;keep repeating until rb.1 activated	
bp0		clrb	ra.0			;turn select off


        	
;-------------------bit copy
		mov     W, rb
		mov	$12, W
	       	xor     $12, #%00001111      ;"1" to Copy the Bit, "0" clears the Bit
		mov	rc, W
;-------------------bit copy		
		jmp 	bp0
[/code]

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