asgpc 发布于 2007-9-11 14:47:00
我写了一个24位的二进制数到BCD码的转换程序，程序已经调试出来，可以正确运行。但总觉得效率低了点，求高手帮我改进一下。修改的目标是尽量缩短转换的时间。我写的程序最大执行数量是1200条左右。
#include<VRS51L3074_Keil.inc>
Bin equ 40H ;二进制高位
;41H
;42H
BCD equ 30H ;存放转换后的千万位
;31H ;存放转换后的百万位
;32H ;存放转换后的十万位
;33H ;存放转换后的万位
;34H ;存放转换后的千位
;35H ;存放转换后的百位
;36H ;存放转换后的十位
;37H ;存放转换后的个位
ORG 0000H
LJMP main
ORG 0200H
main:
MOV 40H,#0A9H ;存放要转换的24位二进制数
MOV 41H,#08AH
MOV 42H,#0C7H
MOV 30H,#00H
MOV 31H,#00H
MOV 32H,#00H
MOV 33H,#00H
MOV 34H,#00H
MOV 35H,#00H
MOV 36H,#00H
MOV 37H,#00H
ACALL Loop1
NOP
NOP
AJMP $
Loop1:
MOV R0,#Bin
CJNE @R0,#98H,Judge11
INC R0
CJNE @R0,#96H,Judge12
INC R0
CJNE @R0,#80H,Judge12
INC 30H
AJMP BRET
Judge11:
JC Loop2
SUB1:
INC 30H
MOV A,42H
SUBB A,#80H
MOV 42H,A
MOV A,41H
SUBB A,#96H
MOV 41H,A
MOV A,40H
SUBB A,#98H
MOV 40H,A
AJMP Loop1
Judge12:
JNC SUB1
Loop2:
MOV R0,#Bin
CJNE @R0,#0FH,Judge21
INC R0
CJNE @R0,#42H,Judge22
INC R0
CJNE @R0,#40H,Judge22
INC 31H
AJMP BRET
Judge21:
JC Loop3
SUB2:
INC 31H
MOV A,42H
SUBB A,#40H
MOV 42H,A
MOV A,41H
SUBB A,#42H
MOV 41H,A
MOV A,40H
SUBB A,#0FH
MOV 40H,A
AJMP Loop2
Judge22:
JNC SUB2
Loop3:
MOV R0,#Bin
CJNE @R0,#01H,Judge31
INC R0
CJNE @R0,#86H,Judge32
INC R0
CJNE @R0,#0A0H,Judge32
INC 32H
AJMP BRET
Judge31:
JC Loop4
SUB3:
INC 32H
MOV A,42H
SUBB A,#0A0H
MOV 42H,A
MOV A,41H
SUBB A,#86H
MOV 41H,A
MOV A,40H
SUBB A,#01H
MOV 40H,A
AJMP Loop3
Judge32:
JNC SUB3
Loop4: CLR C
MOV R0,#Bin
MOV A,@R0
JNZ SUB4
INC R0
CJNE @R0,#27H,Judge41
INC R0
CJNE @R0,#10H,Judge42
INC 33H
AJMP BRET
Judge41:
JC Loop5
SUB4:
INC 33H
MOV A,42H
SUBB A,#10H
MOV 42H,A
MOV A,41H
SUBB A,#27H
MOV 41H,A
MOV A,40H
SUBB A,#00H
MOV 40H,A
AJMP Loop4
Judge42:
JNC SUB4
Loop5:
MOV R0,#Bin
INC R0
CJNE @R0,#03H,Judge51
INC R0
CJNE @R0,#0E8H,Judge52
INC 34H
AJMP BRET
Judge51:
JC Loop6
SUB5:
INC 34H
MOV A,42H
SUBB A,#0E8H
MOV 42H,A
MOV A,41H
SUBB A,#03H
MOV 41H,A
AJMP Loop5
Judge52:
JNC SUB5
Loop6:
CLR C
MOV R0,#Bin
INC R0
MOV A,@R0
JNZ SUB6
INC R0
CJNE @R0,#64H,Judge6
INC 35H
AJMP BRET
Judge6:
JC Loop7
SUB6:
INC 35H
MOV A,42H
SUBB A,#64H
MOV 42H,A
MOV A,41H
SUBB A,#00H
MOV 41H,A
AJMP Loop6
Loop7:
MOV R0,#Bin
INC R0
INC R0
CJNE @R0,#0AH,Judge7
INC 36H
AJMP BRET
Judge7:
JC Loop8
SUB7:
INC 36H
MOV A,42H
SUBB A,#0AH
MOV 42H,A
AJMP Loop7
Loop8:
MOV 37H,42H
BRET:
RET
END
ayb_ice 发布于 2007-9-11 18:54:00
不会是在这显摆吧...
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