binarytobcd.asm

来自「Alarm clock with PIC microcontroller」· 汇编 代码 · 共 70 行

;==============================================================================
; Binary To BCD Conversion
;------------------------------------------------------------------------------

;==============================================================================
; Revision History:
;
; 2005-01-12    Initial version
;------------------------------------------------------------------------------

                include ../pic.inc

                errorlevel -312

                global  BinaryToBcd

                ifdef   HAS_12_BIT_CORE
                extern  RESULT
                endif

;==============================================================================

                udata_ovr
BCD             res     1
                if      HAS_12_BIT_CORE
BIN             res     1               ;12 bit version needs an extra register
                endif

;==============================================================================

                code

BinaryToBcd:


                if      HAS_12_BIT_CORE
                banksel BCD
                clrf    BCD

; TODO!!


                endif

                if      HAS_14_BIT_CORE
                banksel BCD
                clrf    BCD
                addlw   -.80
                rlf     BCD,F
                btfsc   BCD,0
                addlw   .80
                addlw   -.40
                rlf     BCD,F
                btfsc   BCD,0
                addlw   .40
                addlw   -.20
                rlf     BCD,F
                btfsc   BCD,0
                addlw   .20
                addlw   -.10
                rlf     BCD,F
                btfsc   BCD,0
                addlw   .10
                swapf   BCD,F
                iorwf   BCD,W
                return
                endif

                end