All about PIC microcontrollers
Within these pages, you can find many useful pieces of code mostly in assembly for the Microchip PIC micro controller family. A lot of people have spend many hours trying to put the bits and bytes together. If the code is NOT written by a member of the PCB Heaven community, then a link will be added above the code with the original website that this code was found.
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16bit X 16bit Author: Clyde Smith - Stubbs This code was originally located @ http://www.piclist.com
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; Word multiplication for PIC 16C5x
#ifdef _PIC12
psect text,class=ENTRY,delta=2
#else
psect text,class=CODE,delta=2
#endif
global awmul,lwmul
; The main multiply thingo. Called with one operand in btemp and the
; other in btemp+2. It really doesn't matter which one is where.
; The multiplier is copied to plier, and the product built up in
; acca where it belongs
STATUS equ 3
C equ 0
Z equ 2
lwmul
awmul
clrf prod ;initialize product
clrf prod+1
loop
bcf STATUS,C ;clear carry again
rrf plier+1 ;shift multiplier down
rrf plier
btfss STATUS,C ;skip if multiplier lsb not set
goto lop1
movf btemp,w ;add multiplicand to product
addwf prod
movf btemp+1,w
btfsc STATUS,C
incf btemp+1,w
addwf prod+1
lop1
bcf STATUS,C ;clear carry
rlf btemp ;shift multiplicand up
rlf btemp+1
movf plier,w
iorwf plier+1,w
btfss STATUS,Z ;test for early return
goto loop
retlw 0 ;done, result in prod
psect temp,global,class=BANK0,space=1,ovrld
btemp ds 2
plier ds 2
prod ds 2
global used_btemp0
global used_btemp1
global used_btemp2
global used_btemp3
global used_btemp4
global used_btemp5
end |
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