James Grosbach wrote:
>
> What is the code not doing? Can you load the code into the MPLAB simulator? Ca
n
> you single step through it?
>
> I'm unsure how to assist without more information.
>
>     Jim


Runs perfecly on Simulator! But "doesn't run" on PIC17C756! :(

Something is very wrong! Here i have two samples in assembly! The first runs per
fectly and the
second not run! (nothing runs)!


Please, see: WORKS WELL!

                    00426
                    00427         LIST P=17C756
0000                00438                  ORG     0
                    00439
0000 B800           00440                 MOVLB  BANK0 ;select bank1
0001 B000           00441                 MOVLW  0x00
0002 0111           00442                 MOVWF  DDRB  ; portb as output
0003                00443 Loop
                    00444
0003 B000           00445                 MOVLW  0x00
0004 0112           00446                 MOVWF  PORTB ; Flip-Flop
0005 B0FF           00447                 MOVLW  0xFF
0006 0112           00448                 MOVWF  PORTB ; Flip-Flop
0007 C003           00449                 goto Loop    ; stay in LOOP
                    00450
                    00451                 END
--------------------------------------------------------------------------------
-------------

Please, see: DOESN'T WORK! (nothing happens)! (But i verified that the /CS of my
 external
EPROM stay enabled, like the first sample)

                    00427         LIST P=17C756
0000                00438                 ORG     0
0000 C009           00439                 GOTO    start
                    00440
0001                00441 main
0001 B800           00442                  MOVLB  BANK0 ;select bank1
0002 B000           00443                  MOVLW  0x00
0003 0111           00444                  MOVWF  DDRB  ; portb as output
                    00445
0004                00446 Loop
                    00447
0004 B000           00448                 MOVLW  0x00
0005 0112           00449                 MOVWF  PORTB ; Flip-Flop
0006 B0FF           00450                 MOVLW  0xFF
0007 0112           00451                 MOVWF  PORTB ; Flip-Flop
0008 C004           00452                 goto Loop    ; stay in LOOP
                    00453
0009                00454 start
0009 C001           00455                 goto   main
                    00456                 END

The only diference is that there is a goto FORWARD! :(

And the Machine Code that the MPLABC-17 creates has as first instruction:

;-----------------------------------------------------------;
; Branch to startup code                                    ;
;-----------------------------------------------------------;
0000     c0c2     GOTO      0xc2  ;  goto  _start  section
_start_section   CODE

What does not the PIC17C756 work!

Please, help me!

Miguel :(

PS: I did change the Crystal for 2MHZ, and nothing! Only the first sample works
well! (that
hasn't the GOTO FORWARD)