>Hi Guys,
>
>I 'm using microchip's simulator (MPSIM 5.20) to test my program. For the
>loading and the execution of the program, everything went alright. However,
>I'm experiencing difficulty  creating the stimulus file.
>
>I'm not too clear on how the steps in the this file are determined. For the
>example (see below) given in the users manual, there is  cycle 3, cycle 10,
>cycle 16  etc. in the Column Headings section, corresponding with step 3,
>step 4, step 9 etc. Where did these numbers come from?
>
>Thanks for your speedy response.
>
>Rawle
>
>
>STEP    RB2     RA3   RA2   RA1   RA0     !Column Headings
>3        0      0     1      0     0       !stimulus before cyc1e 3
>4        1      0     1      0     1       !injected before cycle 10
>9        1      1     0      1     0       !injected before cycle 16
>10       0      1     0      1     1       !stimulus before cyc1e 3
>15       0      0     0      0     0       !injected before cycle 9
>16       1      0     0      0     1       !injected before cycle 15
>
>Fig 1.  Stimulus file (sample.sti)
>
>
>
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>;*******************************************************************
>;                           SAMPLE.ASM
>;                   8x8 Software Multiplier
>;*******************************************************************
>;
>;   The 16 bit result is stored in 2 bytes
>;
>; Before calling the subroutine " mpy ", the multiplier should
>; be loaded in location " mulplr ", and the multiplicand in
>; " mulcnd " . The 16 bit result is stored in locations
>; H_byte & L_byte.
>;
>;       Performance :
>;                       Program Memory  :  15 locations
>;                       # of cycles     :  71
>;                       Scratch RAM     :   0 locations
>;
>;  This routine is optimized for code efficiency ( looped code )
>;  For time efficiency code refer to "mult8x8F.asm" ( straight line code )
>;*******************************************************************
>;
>        LIST    p=16C54 ; PIC16C54 is the target processor
>
>mulcnd  equ     09      ; 8 bit multiplicand
>mulplr  equ     10      ; 8 bit multiplier
>H_byte  equ     12      ; High byte of the 16 bit result
>L_byte  equ     13      ; Low byte of the 16 bit result
>count   equ     14      ; loop counter
>portb   equ     06      ; I/O register F6
>STATUS  equ     03      ; STATUS register F3
>CARRY   equ     0       ; Carry bit in status register
>Same    equ     1       ;
>;
>;
>; *****************************         Begin Multiplier Routine
>mpy_S   clrf    H_byte
>        clrf    L_byte
>        movlw   8
>        movwf   count
>        movf    mulcnd,w
>        bcf     STATUS,CARRY    ; Clear the carry bit in the status Reg.
>loop    rrf     mulplr,Same
>        btfsc   STATUS,CARRY
>        addwf   H_byte,Same
>        rrf     H_byte,Same
>        rrf     L_byte,Same
>        decfsz  count,Same
>        goto    loop
>;
>        retlw   0
>;
>;********************************************************************
>;               Test Program
>;*********************************************************************
>start   clrw
>        option
>main    movf    portb,w
>        movwf   mulplr          ; multiplier (in mulplr) = 05
>        movf    portb,w
>        movwf   mulcnd
>;
>call_m  call    mpy_S           ; The result is in locations F12 & F13
>                               ; H_byte & L_byte
>;
>        goto    main
>;
>        org     01FFh
>        goto    start
>;
>     END
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>Step    RB2     RA3   RA2   RA1   RA0     !Column Headings
>3        0      0     1      0     0       !stimulus before cyc1e 3
>4        1      0     1      0     1       !injected before cycle 10
>9        1      1     0      1     0       !injected before cycle 16
>10       0      1     0      1     1       !stimulus before cyc1e 3
>15       0      0     0      0     0       !injected before cycle 9
>16       1      0     0      0     1       !injected before cycle 15
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>Bye,
>Rawle.
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