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PIC17C44 Datasheet(PDF) 50 Page - Microchip Technology

No. de pieza PIC17C44
Descripción Electrónicos  High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
PDF  241 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC17C44 Datasheet(HTML) 50 Page - Microchip Technology

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PIC17C4X
DS30412C-page 50
© 1996 Microchip Technology Inc.
Example 8-3 shows the sequence to do a 16 x 16
unsigned multiply. Equation 8-1 shows the algorithm
that is used. The 32-bit result is stored in 4 registers
RES3:RES0.
EQUATION 8-1:
16 x 16 UNSIGNED
MULTIPLICATION
ALGORITHM
RES3:RES0
=
ARG1H:ARG1L * ARG2H:ARG2L
=
(ARG1H * ARG2H * 216)+
(ARG1H * ARG2L * 28)+
(ARG1L * ARG2H * 28)+
(ARG1L * ARG2L)
EXAMPLE 8-3:
16 x 16 MULTIPLY ROUTINE
MOVFP
ARG1L, WREG
MULWF
ARG2L
; ARG1L * ARG2L ->
;
PRODH:PRODL
MOVPF
PRODH, RES1 ;
MOVPF
PRODL, RES0 ;
;
MOVFP
ARG1H, WREG
MULWF
ARG2H
; ARG1H * ARG2H ->
;
PRODH:PRODL
MOVPF
PRODH, RES3 ;
MOVPF
PRODL, RES2 ;
;
MOVFP
ARG1L, WREG
MULWF
ARG2H
; ARG1L * ARG2H ->
;
PRODH:PRODL
MOVFP
PRODL, WREG ;
ADDWF
RES1, F
; Add cross
MOVFP
PRODH, WREG ;
products
ADDWFC
RES2, F
;
CLRF
WREG, F
;
ADDWFC
RES3, F
;
;
MOVFP
ARG1H, WREG ;
MULWF
ARG2L
; ARG1H * ARG2L ->
;
PRODH:PRODL
MOVFP
PRODL, WREG ;
ADDWF
RES1, F
; Add cross
MOVFP
PRODH, WREG ;
products
ADDWFC
RES2, F
;
CLRF
WREG, F
;
ADDWFC
RES3, F
;



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