PIC17C44-08SLASHP datasheet(50/240 Pages) MICROCHIP

номер детали	PIC17C44-08/P

подробное описание детали	High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

PDF	240 Pages

Scroll/Zoom	100%

производитель	MICROCHIP [Microchip Technology]

домашняя страница	http://www.microchip.com

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50 / 240 page

PIC17C4X

DS30412C-page 50

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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