 |
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
|
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
PIC17C44 Datasheet(PDF) 51 Page - Microchip Technology |
|
|
|||||||||||||||||||||||||||||
PIC17C44 Datasheet(HTML) 51 Page - Microchip Technology |
|
|
51 / 241 page  © 1996 Microchip Technology Inc. DS30412C-page 51 PIC17C4X Example 8-4 shows the sequence to do an 16 x 16 signed multiply. Equation 8-2 shows the algorithm that 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 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) EXAMPLE 8-4: 16 x 16 SIGNED 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 ; ; BTFSS ARG2H, 7 ; ARG2H:ARG2L neg? GOTO SIGN_ARG1 ; no, check ARG1 MOVFP ARG1L, WREG ; SUBWF RES2 ; MOVFP ARG1H, WREG ; SUBWFB RES3 ; SIGN_ARG1 BTFSS ARG1H, 7 ; ARG1H:ARG1L neg? GOTO CONT_CODE ; no, done MOVFP ARG2L, WREG ; SUBWF RES2 ; MOVFP ARG2H, WREG ; SUBWFB RES3 ; CONT_CODE : |
|
Enlace URL |
| ¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Enlace a la hoja de datos | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Spanish ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
