參數(shù)資料
型號： ENC424J600-I/ML
廠商： Microchip Technology
文件頁數(shù)： 156/168頁
文件大?。?/td> 0K
描述： IC ETHERNET CTRLR W/SPI 44-QFN
視頻文件： Fast 100 Mbps Ethernet PICtail Plus Overview
標(biāo)準(zhǔn)包裝： 45
控制器類型： 以太網(wǎng)控制器（IEEE 802.3）
接口： SPI
電源電壓： 3 V ~ 3.6 V
電流 - 電源： 96mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 44-VQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 44-QFN（8x8）
包裝： 管件
產(chǎn)品目錄頁面： 684 (CN2011-ZH PDF)
配用： AC164132-ND - BOARD DAUGHTER PICTAIL ETHERNET
PIC18F2220/2320/4220/4320
DS39599G-page 86
2007 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 four registers,
RES3:RES0.
EQUATION 8-1:
16 x 16 UNSIGNED
MULTIPLICATION
ALGORITHM
EXAMPLE 8-3:
16 x 16 UNSIGNED
MULTIPLY ROUTINE
Example 8-4 shows the sequence to do a 16 x 16
signed multiply. Equation 8-2 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 pairs’ Most Significant bit (MSb)
is tested and the appropriate subtractions are done.
EQUATION 8-2:
16 x 16 SIGNED
MULTIPLICATION
ALGORITHM
EXAMPLE 8-4:
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, F
; Add cross
MOVF
PRODH, W
; products
ADDWFC RES2, F
;
CLRF
WREG
;
ADDWFC RES3, F
;
MOVF
ARG1H, W
;
MULWF
ARG2L
; ARG1H * ARG2L ->
; PRODH:PRODL
MOVF
PRODL, W
;
ADDWF
RES1, F
; Add cross
MOVF
PRODH, W
; products
ADDWFC RES2, F
;
CLRF
WREG
;
ADDWFC RES3, F
;
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, F
; Add cross
MOVF
PRODH, W
; products
ADDWFC RES2, F
;
CLRF
WREG
;
ADDWFC RES3, F
;
MOVF
ARG1H, W
;
MULWF
ARG2L
; ARG1H * ARG2L ->
; PRODH:PRODL
MOVF
PRODL, W
;
ADDWF
RES1, F
; Add cross
MOVF
PRODH, W
; products
ADDWFC RES2, F
;
CLRF
WREG
;
ADDWFC RES3, F
;
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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ENC424J600-IPT 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Stand-Alone 10/100 Ethernet Controller with SPI or Parallel Interface
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ENC424J600T-IPT 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Stand-Alone 10/100 Ethernet Controller with SPI or Parallel Interface
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