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.
Because the code is copied to our servers, you should know that:
- The responsible web master of the website that the code is taken, has been informed and he has agreed to copy the code
- All emails from the above contact have been kept as records but due to personal privacy cannot be shown in public.
- The author of the code is always clearly indicated above the code. In some cases the author is unknown. If you happen to be the author of the code or you know the person who wrote it, please inform us by email and it will be added ASAP.
We would personally like to send the credits to all the people that managed to write some very interesting code and publish it, and special thanx to the people that originally hosted those code snippets and gave us the permission to copy them.
View code
16bit X 16bit
Author: Clyde Smith - Stubbs
This code was originally located @ http://www.piclist.com
Follow this link to go back
; 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 |
Follow this link to go back
|
 HOT in heaven!
|
|
Home
Projects
Experiments
Circuits
Theory
BLOG
PIC Tutorials
Time for Science
Reddit this