On Tue, 5 Feb 2002 18:07:33 +0100, wouter van ooijen & floortje hanneman wrote: >> The '877 has an instruction set that isn't particularly different from >> the rest of the PIC's. > >How do you know? My f877 datasheet does not list the instructions in = detail! >Any source for knowing whether the 87x's do (officially) support tris? > Check the DS30292B 'datasheet'. (I use quotes because it's about 200 pages long.) It covers the 16F87X (873,874,876,877) parts. Section 13 (pages 137 through 144) has a complete instruction set reference. Although I didn't do a line-by-line comparison, it appears to be the same as other 16C and 16F parts. On the OPTION and TRIS instructions, there's a note recommending against using them (as there is in most of Microchip's newer data sheets). They appear in neither the summary table nor the detailed list of instructions. Regards, Bob -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu