Newbie problem with 12c671

snipped-for-privacy@teknowledge.co.uk (Jonathan Campbell) wrote in news: snipped-for-privacy@posting.google.com:

Don't know how exact your timing diagrams are, but that delay looks suspiciously like one half-period of the frequency you're outputting on port B. Some code would help, but it looks like when you enable the square-wave output on port B you're starting off in the low phase rather than the high phase.

It's not a big program, and I'm trying to do it without interrupts. Anyway, Here's the code:

{ LoadOscCal (); /* set bank 1 registers set RP0 */ STATUS |= 0x20 ; ADCON1 = 0x07 ; /* all outputs digital */ INTCON = 0x00 ; /* disable all interrupts */

/* set bank 0 registers */ STATUS &= ~0x20 ; ADCON0 = 0x00 ; TRISA = 0x0C ; /* set the ports */ /* start the main loop */ MainLoop:

if (PG.B3) { PG.B0 = 1 ; for (Wait = 0; Wait < 4; Wait++) ; /* these delays need to be changed */ PG.B0 = 0 ; for (Wait = 0; Wait < 4; Wait++) ; } if (PG.B2) { PG.B5 = 1 ; for (Wait = 0; Wait < 20; Wait++) ; PG.B5 = 0 ; } goto MainLoop ; }

#pragma asm RbAddr=_TOPROM+1 LoadOscCal: movlw RbAddr>>8 movwf PCLATH call RbAddr bsf STATUS,RP0 movwf OSCCAL bcf STATUS,RP0 clrf PCLATH MRET 0 LOCSavePC=$ org RbAddr retlw 0xff org LOCSavePC #pragma asmend