Post by thread:Arithmetic routines

You will find many examples of arithmetic routines in the Embedded Contro= ller Handbook from Microchip. Most of the 16bit versions can be download= ed from Microchips WWW site, but they should be tested before use: I have= tried the 32/16 bit division routine and it goes a bit mad under certain= conditions (anyone else seen this behaviour?). In the UK you can buy the Embedded Controller Handbook from Maplin or RS.= Andy Errington (still hanging head in shame for perpetuating the last SPA= M) ---------- From: Geoff Wootton[SMTP:spam_OUTWOOTTONGTakeThisOuTvms1.bham.AC.UK] Sent: 28 November 1995 14:16 To: Multiple recipients of list PICLIST Subject: Arithmetic routines Does anyone know where I might be able to download some basic multi-byte arithmetic routines. For example, code for 16 bit subtraction etc. Geoff.

Geoff Wootton <.....PICLISTKILLspam@spam@MITVMA.MIT.EDU> wrote: > Does anyone know where I might be able to download some basic > multi-byte arithmetic routines. For example, code for 16 bit > subtraction etc. Geoff: You can (usually, except when the site's under construction) get code like this from my web page. Here's a 16-bit subtract for the 16Cxx: ; ; A = A - B. Enter with A in "AHI:ALO", B in "BHI:BLO". ; Exits with difference in AHI:ALO. ; MOVF BLO,W SUBWF ALO MOVF BHI,W SKPC ADDLW 1 SUBWF AHI Off the top of my head, it looks as though code for the 16C5x would be identical, except that you'd want to replace the "ADDLW 1" with "DECF AHI". -Andy Andrew Warren - fastfwdKILLspamix.netcom.com Fast Forward Engineering, Vista, California http://www.geopages.com/SiliconValley/2499