Download Assembler/Linker/Librarian User's Guide

Assembler Examples, Tips and Tricks
goto
TestCode
;Go back to top of program and
;run the delay again.
;Subroutine, called by the Macro Dly32 (20 Tcy per loop)
DoDly32
movlw
H'FF'
;Start with -1 in W
addwf
btfsc
clrw
Dly0,F
STATUS,C
;LSB decrement
;was the carry flag set?
;If so, 0 is put in W
addwf
btfsc
clrw
Dly1,F
STATUS,C
;Else, we continue.
addwf
btfsc
clrw
Dly2,F
STATUS,C
addwf
btfsc
clrw
Dly3,F
STATUS,C
iorwf
iorwf
iorwf
iorwf
Dly0,W
Dly1,W
Dly2,W
Dly3,W
;Inclusive-OR all variables
;together to see if we have reached
;0 on all of them.
btfss
goto
retlw
STATUS,Z
DoDly32
0
;Test if result of Inclusive-OR's is 0
;It was NOT zero, so continue counting
;It WAS zero, so exit this subroutine.
;0 in W
;0 in W
;0 in W
END
© 2009 Microchip Technology Inc.
DS33014K-page 133