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PIC Microcontoller Program Flow ASCII Conversion Method

Convert ASCII to Upper Case


This is a practical application of conditional replacement. I think this subroutine demonstrates how the code works quite well.
   addlw   255 - 'z'            ;  Get the High limit
   addlw   'z' - 'a' + 1        ;  Add Lower Limit to Set Carry
   btfss   STATUS, C            ;  If Carry Set, then Lower Case
    addlw  h'20'                ;   Carry NOT Set, Restore Character
   addlw   'A'                  ;  Add 'A' to restore the Character


file: /Techref/microchip/upcase.htm, 1KB, , updated: 2008/2/25 14:05, local time: 2023/9/29 06:44,

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