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PIC Microcontoller Memory Method

18C Literal String Tables

Bob Ammerman of RAm Systems says:

In the 18C you could handle literal strings like this:
        rcall    display_it the characters in memory right here... instruction to execute...

        movff    tosl,tblptrl
        movff    tosh,tblptrh
        movff   tosu,tblptru        ; can omit when we know tblptru is 0 and we have <= 64K of memory

        ... process the characters, incrementing TBLPTR as you go

        btfsc     tblptrl,0            ; make sure we handled an even number
of chars
        tblrd*+                           ; do dummy read to align on even
character position

       movf    tblptrl,W,A
       movwf tosl,A
       movf    tblptrh,W,A
       movwf tosh,A
       movf    tblptru,W,A  ; can omit when we have ...
       movwf tosu,A          ; .. <= 64K of memory


Note that LFSR is broken on some 18C chips! Using it causes random (ie: unpredicted) changes to RAM.


file: /Techref/microchip/18c/tables.htm, 1KB, , updated: 2001/4/17 12:57, local time: 2024/7/20 03:17,

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