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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View code
16bit X 16bit Author: Bob Fehrenbach - Scott Dattalo This code was originally located @ http://www.piclist.com
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;*******************************************************************
; Double Precision Multiplication
;
; n_2 : n_1 * n_4 : n_3 -> q_4:q_3:q_2:q_1
;
; Standard shift and add.
; Execution time: 215 to 295 clock cycles.
; Code space: 22 locations
;
; Cleaned up and corrected version from Microchip Ap note by BF.
; Note: Ap note has errors! Additional mods by Scott Dattalo.
;
;*******************************************************************
mpy16b16: macro
local m1, m2
clrf q_4
clrf q_3
clrf q_2
clrf q_1
bsf q_2, 7
m1:
rrf n_2, f
rrf n_1, f
skpc
goto m2
movf n_3, w
addwf q_3, f
movf n_4, w
skpnc
incfsz n_4, w
addwf q_4, f
m2:
rrf q_4, f
rrf q_3, f
rrf q_2, f
rrf q_1, f
skpc
goto m1
endm |
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