Can you tell what microcontroller model are you using? El dia 08/04/2015 12:19, "IVP" va escriure: > > Perhaps you have a zapped MCLR pin. Have you tried with > > another chip? > > Yes, three straight out of the tube and a couple of older ones > from a different batch > > Interestingly, if /MCLR is grounded when power is applied > the LCD doesn't initialise. Nor does it when you release the > button for /MCLR to go to its usual high. Using the LATB,0 > markers to view progress, it seems code is not being executed > at all. The oscillator (HS crystal) is going though. The power > needs to be cycled with /MCLR high to get the s/w running > as you'd normally expect it to. > > So the button is doing "something". I must be missing a h/w > directive somewhere but the path between pin and internal > reset signal is pretty straight-forward > > Joe > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2015.0.5863 / Virus Database: 4321/9483 - Release Date: 04/07/15 > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .