參數(shù)資料
型號(hào)： DM164134
廠商： Microchip Technology
文件頁數(shù)： 93/116頁
文件大小： 0K
描述： KIT DEV PIC18F4XK22
標(biāo)準(zhǔn)包裝： 1
系列： PIC® 18F
類型： MCU
適用于相關(guān)產(chǎn)品： PIC18F4XK22，PIC18F2XK22
所含物品： 板，文檔
PIC18FXX8
DS41159E-page 76
2006 Microchip Technology Inc.
Example 7-3 shows the sequence to do a 16 x 16
unsigned multiply. Equation 7-1 shows the algorithm
that is used. The 32-bit result is stored in four registers,
RES3:RES0.
EQUATION 7-1:
16 x 16 UNSIGNED
MULTIPLICATION
ALGORITHM
EXAMPLE 7-3:
16 x 16 UNSIGNED
MULTIPLY ROUTINE
Example 7-4 shows the sequence to do a 16 x 16
signed multiply. Equation 7-2 shows the algorithm
used. The 32-bit result is stored in four registers,
RES3:RES0. To account for the sign bits of the argu-
ments, each argument pair’s Most Significant bit (MSb)
is tested and the appropriate subtractions are done.
EQUATION 7-2:
16 x 16 SIGNED
MULTIPLICATION
ALGORITHM
EXAMPLE 7-4:
16 x 16 SIGNED
MULTIPLY ROUTINE
MOVF
ARG1L, W
MULWF
ARG2L
; ARG1L * ARG2L ->
; PRODH:PRODL
MOVFF
PRODH, RES1
;
MOVFF
PRODL, RES0
;
MOVF
ARG1H, W
MULWF
ARG2H
; ARG1H * ARG2H ->
; PRODH:PRODL
MOVFF
PRODH, RES3
;
MOVFF
PRODL, RES2
;
MOVF
ARG1L, W
MULWF
ARG2H
; ARG1L * ARG2H ->
; PRODH:PRODL
MOVF
PRODL, W
;
ADDWF
RES1
; Add cross
MOVF
PRODH, W
; products
ADDWFC
RES2
;
CLRF
WREG
;
ADDWFC
RES3
;
MOVF
ARG1H, W
;
MULWF
ARG2L
; ARG1H * ARG2L ->
; PRODH:PRODL
MOVF
PRODL, W
;
ADDWF
RES1
; Add cross
MOVF
PRODH, W
; products
ADDWFC
RES2
;
CLRF
WREG
;
ADDWFC
RES3
;
RES3:RES0
=
ARG1H:ARG1L
ARG2H:ARG2L
=
(ARG1H
ARG2H 216) +
(ARG1H
ARG2L 28) +
(ARG1L
ARG2H 28) +
(ARG1L
ARG2L)
MOVF
ARG1L, W
MULWF
ARG2L
; ARG1L * ARG2L ->
; PRODH:PRODL
MOVFF
PRODH, RES1
;
MOVFF
PRODL, RES0
;
MOVF
ARG1H, W
MULWF
ARG2H
; ARG1H * ARG2H ->
; PRODH:PRODL
MOVFF
PRODH, RES3
;
MOVFF
PRODL, RES2
;
MOVF
ARG1L, W
MULWF
ARG2H
; ARG1L * ARG2H ->
; PRODH:PRODL
MOVF
PRODL, W
;
ADDWF
RES1
; Add cross
MOVF
PRODH, W
; products
ADDWFC
RES2
;
CLRF
WREG
;
ADDWFC
RES3
;
MOVF
ARG1H, W
;
MULWF
ARG2L
; ARG1H * ARG2L ->
; PRODH:PRODL
MOVF
PRODL, W
;
ADDWF
RES1
; Add cross
MOVF
PRODH, W
; products
ADDWFC
RES2
;
CLRF
WREG
;
ADDWFC
RES3
;
BTFSS
ARG2H, 7
; ARG2H:ARG2L neg?
BRA
SIGN_ARG1
; no, check ARG1
MOVF
ARG1L, W
;
SUBWF
RES2
;
MOVF
ARG1H, W
;
SUBWFB
RES3
;
SIGN_ARG1
BTFSS
ARG1H, 7
; ARG1H:ARG1L neg?
BRA
CONT_CODE
; no, done
MOVF
ARG2L, W
;
SUBWF
RES2
;
MOVF
ARG2H, W
;
SUBWFB
RES3
;
CONT_CODE
:
RES3:RES0
=
ARG1H:ARG1L
ARG2H:ARG2L
=
(ARG1H
ARG2H 216) +
(ARG1H
ARG2L 28) +
(ARG1L
ARG2H 28) +
(ARG1L
ARG2L)+
(-1
ARG2H<7> ARG1H:ARG1L 216) +
(-1
ARG1H<7> ARG2H:ARG2L 216)
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DM173001 功能描述:開發(fā)板和工具包 - PIC / DSPIC PICDEM 17 PIC17CXX RoHS:否 制造商:Microchip Technology 產(chǎn)品:Starter Kits 工具用于評(píng)估:chipKIT 核心:Uno32 接口類型: 工作電源電壓:
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