From Mike McLaren, K8LH, (Westland, MI, USA)
While collaborating on a little 10F200 project recently (256 words of program memory and 16 bytes RAM) I came up with the following little Bin2Bcd routine. The additional code (PrintIt, PutDigit, etc.) simply prints the "0".."255" number as right justified with leading zero suppression;
;****************************************************************** ; * ; 8 bit to 3 digit half-packed BCD, Mike McLaren, K8LH (Jan-09) * ; * ; input: WREG, 0x00..0xFF, 0..255 * ; output: tens, 0x00..0x25, packed bcd * ; ones, 0x00..0x09 * ; * ; 12 words, 2 variables ; tens equ 0x1A ; packed BCD 'hundreds' & 'tens' ones equ 0x1B ; single BCD 'ones' mask equ 0x1C ; Bin2Bcd clrf tens ; decf tens,F ; preset 'tens' to -1 div10 movwf ones ; incf tens,F ; bump 'tens', 0x00..0x25 movlw 6 ; using "packed bcd" format addwf tens,W ; bcd "digit carry"? skpndc ; no, skip, else movwf tens ; fix 'tens' movlw 10 ; ones = ones - 10 subwf ones,W ; borrow? bc div10 ; no, branch, else PrintIt movlw " " ; prep leading zero suppression movwf mask ; mask = 0x20 = " " (space char) swapf tens,W ; get hundreds, 0..2 call PutDigit ; print " " or "1".."2" movf tens,W ; get tens, 0..9 call PutDigit ; print " " or "0".."9" movf ones,W ; get ones, 0..9 goto PutNumber ; always print "0".."9" PutDigit andlw 0x0F ; skpz ; PutNumber bsf mask,4 ; mask = 0x30 = "0" iorwf mask,W ; wreg = " " or "0".."9" goto Put232 ; Put232 or PutLCD
file: /Techref/microchip/math/radix/b2bhp-8p3d-mm.htm, 5KB, , updated: 2010/10/4 05:41, local time: 2024/8/15 00:56,
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