> Hi there !!
> 
> Name here is Bart, and i have got some problems with my LUTs (lookup
> tables) & PIC16C73A or 16C76.
> 
> I have to implement 10 tables of 127 bytes and the problem is that
> when an interrupt occurs the 
> program counter jumps somewhere in space ... lost in space ...
> 
> I don't understand the program counter mechanism very well ...
> 
> Can someone reserve some time to have a look at my experiments
> 
> I have included 2 files, the main program file and the LUT-file
> 
> Thanks a lot ... and enjoy !
> 
> 
> Main Program:
> -----------------------
> 
>       list p=16C76                  ; select controller
>       include "P16C76.INC"            ; include this file where
>                                       ; all initialisation of
> Registers 
>                                       ; are defined.
> 
>       __CONFIG        _HS_OSC&_WDT_OFF&_PWRTE_OFF;
> 
> 
> pointadres    equ     0x020
> pointvalue    equ     0x021
> WBACKUP               equ     0x022
> WBACKUPINT    equ     0x023
> STATUSBACKUPINT       equ     0x024
> 
> ;+++++++++++++++++++++++++++++++++++++++++++++++++++
> GoSub MACRO Subrtn
> ; Performa "call subroutine" anywhere in memory.
> ;+++++++++++++++++++++++++++++++++++++++++++++++++++
>       movwf   WBACKUP
>       movlw   HIGH Subrtn
>       movwf   PCLATH
>       movfw   WBACKUP
>       call    Subrtn
>       movwf   WBACKUP
>       movlw   HIGH $
>       movwf   PCLATH
>       movfw   WBACKUP
>       ENDM
> 
> Startup
> 
>       org     0x000
>       goto    Init            ; reset vector address
> 
>       org     0x004           ; interrupt vector address
>       goto    ServiceInt
> 
>       org     0x010
> Init
>       movlw   0x000           ; pointerwaarden 0..127
>       movwf   pointadres
> 
>       bsf     STATUS,RP0      ; PAGE1
>       bcf     STATUS,RP1      ; PAGE1
>       movlw   0x000           ; PAGE1
>       movwf   TRISB           ; PAGE1
>       movwf   TRISC           ; PAGE1
>       movlw   0x007           ; PAGE1
>       movwf   OPTION_REG      ; PAGE1
>       bcf     STATUS,RP0      ; PAGE1
>       bcf     STATUS,RP1      ; PAGE1
> 
>       clrf    TMR0
>       movlw   0x0E0
>       movwf   INTCON
> 
> 
> Main
>       movfw   pointadres      ;1
>       GoSub   M_ONTime
>       movwf   PORTB
> 	
>       movfw   pointadres      ;2
>       GoSub   L_ONTime
>       movwf   PORTB
> 
>       movfw   pointadres      ;3
>       GoSub   M_PWM
>       movwf   PORTB
> 	
>       movfw   pointadres      ;4
>       GoSub   L_PWM
>       movwf   PORTB
> 	
>       movfw   pointadres      ;5
>       GoSub   M_MSB
>       movwf   PORTB
> 	
>       movfw   pointadres      ;6
>       GoSub   L_MSB
>       movwf   PORTB
> 	
>       movfw   pointadres      ;7
>       GoSub   M_Mid
>       movwf   PORTB
> 	
>       movfw   pointadres      ;8
>       GoSub   L_Mid
>       movwf   PORTB
> 	
>       movfw   pointadres      ;9
>       GoSub   M_LSB
>       movwf   PORTB
> 	
>       movfw   pointadres      ;10
>       GoSub   L_LSB
>       movwf   PORTB
> 
>       goto    Main
> 	
> 
>       include "e:\firmware\hbtable.h"
> 
> ; ServiceInt
> ServiceInt
>       movwf   WBACKUPINT
>       movfw   STATUS
>       movwf   STATUSBACKUPINT
>       btfss   INTCON,T0IF
>       goto    ServiceIntEnd
> Timer0Int
>       bcf     STATUS,RP0
>       bcf     INTCON,T0IF
>       bsf     PORTC,7
>       clrf    TMR0
>       bsf     INTCON,T0IE
> 
> ServiceIntEnd
>       movfw   STATUSBACKUPINT
>       movwf   STATUS
>       movfw   WBACKUPINT
>       retfie
> 
>       END
> 
> Table file:
> -----------------
> 
> ;filename HBTABLE.H
> ;
> ; LOOK-UP Table definition
> ;
> ; ON_Time     adres
> ;  M_ONTime     1600
> ;  L_ONTime     1700 
> ;
> ; PWM_Freq
> ;  M_PWM        1800
> ;  L_PWM        1900
> ;
> ; 24bconv
> ;  M_MSB        1A00
> ;  L_MSB        1B00
> ;  M_Mid        1C00
> ;  L_Mid        1D00
> ;  M_LSB        1E00
> ;  L_LSB        1F00
> ;
> ;*********************************************************************
> ********
> 
> 
> 
> 
> ;*********************************************************************
> ********
> ;
> ; LOOK-UP Table ON_Time
> ;
> ;*********************************************************************
> ********
> 
> 
>       org     0x1600
>       de      "M_ONTime",0
> 
> M_ONTime              ; High part ON_Time
>       addwf   PCL,f
> 
>       retlw   0x001	
>       retlw   0x019	
> 
>       *****127 values*****
> 
>       org     0x1700
>       de      "L_ONTime",0
> 
> L_ONTime              ; Low part ON_Time
>       addwf   PCL,f
> 
>       retlw   0x002	
>       retlw   0x032	
> 
>       *****127 values*****
> 
> 
> 
>       org     0x1800
>       de      "H_PWM   ",0
> 
> M_PWM                 ; High part PWM frequency
>       addwf   PCL,f
> 
>       retlw   0x004	
>       retlw   0x04B	
> 
>       *****127 values*****
> 
> 
>       org     0x1900
>       de      "L_PWM   ",0
> 
> L_PWM                 ; Low part PWM frequency
>       addwf   PCL,f
> 
>       retlw   0x008	
>       retlw   0x064	
> 
>       *****127 values*****
> 
> 
>       org     0x1A00
>       de      "M_MSB   ",0
> 
> M_MSB                 ; High part MSB 24bit word
>       addwf   PCL,f
> 
>       retlw   0x001	
>       retlw   0x07D	
> 
>       *****127 values*****
> 
> 
>       org     0x1B00
>       de      "L_MSB   ",0
> 
> L_MSB                 ; Low part MSB 24bit word
> 
>       addwf   PCL,f
> 
>       retlw   0x002	
>       retlw   0x096	
> 
>       *****127 values*****
> 
> 
>       org     0x1C00
>       de      "M_Mid   ",0
> M_Mid                 ; High part Mid 24bit word
> 
>       addwf   PCL,f
> 
>       retlw   0x004	
>       retlw   0x0AF	
> 
>       *****127 values*****
> 
> 
>       org     0x1D00
>       de      "L_Mid   ",0
> 
> L_Mid                 ; Low part Mid 24bit word
>       addwf   PCL,f
> 
>       retlw   0x008	
>       retlw   0x0C8	
> 
>       *****127 values*****
> 
> 
>       org     0x1E00
>       de      "M_LSB   ",0
> 
> M_LSB                 ; High part LSB 24bit word
>       addwf   PCL,f
> 
>       retlw   0x001	
>       retlw   0x0E1	
> 
>       *****127 values*****
> 
> 
>       org     0x1F00
>       de      "L_LSB   ",0
> 
> L_LSB                 ; Low part LSB 24bit word
>       addwf   PCL,f
> 
>       retlw   0x002	
>       retlw   0x0FA	
> 
>       *****127 values*****
> 
> 
> Tnx ! , Bart
>