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16位二进制转换为bcd码的c51汇编程序(16 bit binary converted to BCD code C51 assembler)
16位二进制转换为bcd码的c51汇编程序(16 bit binary converted to BCD code C51 assembler) Algorithm 16 bit binary code to BCD and 51 assembly: N=b15~b0 N=[b15~b8]*256+[b7~b0] =[b15~b12]*4096+[b11~b0] Four, the high [b15~b12] value range is 0~15, represents the number 4096 N=[b15~b12]*4000+{[b15~b12]* (100-4) +[b11~b0]} X [b15~b12], a: N=x*4000+{x* (100-4) +[b11~b0] Namely: n=4*x (1000) +x (100) +[b11~b0]-4*x Back on the site: [b11~b0]-4*x, if less than 356, is directly converted into BCD code, if Larger, take 11~7 as the number 128 y, plus y at 100, ten plus 3*y, and in [b6~b0] minus 2*y There: N=n=4*x (1000) + (x+y) (100) +3*y (ten) +[b6~b0]-2*y Thus, it can be defined by the high 9 bits each numerical [b15~b7] transform out decimal places, may be greater than 9, to the end to tidy up. The rest of the low 7 bits into BCD code is very simple. This is someone elses ideas, easy to understand, but the assembly is not too good to expect someone to write, write, here is an algorithm of my classmates: Eight minus one, eighth and 256, (stored in compressed BCD code three bytes 100 2, ten and 5 members, plus 6) ORG 0000H AJMP MAIN ORG 0003H AJMP INT0 ORG 0100H MAIN: MOV SP, #60H MOV R4, #30 MOV TMOD, #01H MOV TH0, #00H MOV TL0, #00H MOV IE, #81H SETB TR0 SETB IT0 LOOP: LCALL BCD LCALL UBCD LOOP1: LCALL XIANSHI LCALL DELAY DJNZ R4, LOOP1 AJMP LOOP BCD: MOV A, #00H MOV 38H, 41H MOV 37H, 40H MOV 34H, A MOV 35H, A MOV 36H, A MOV A, 37H MOV B, #100 DIV AB MOV 35H, A MOV A, B MOV B, #10 DIV AB SWAP A ADD A, B MOV 36H, A MOV R3,38H CJNE R3, #0, JIA AJMP RETURN JIA: CLR C MOV A, 36H ADDC A, #56H DA A MOV 36H, A MOV A, 35H ADDC A, #02H DA A MOV 35H, A MOV A, 34H ADDC A, #0 MOV 34H, A DJNZ R3, JIA RETURN:RET UBCD: MOV A, 34H CJNE A, #00H, WUWEI MOV R1, #35H MOV R0, #36H MOV A, #00H XCHD A, @R0 MOV 30H, A MOV A, @R0 SWAP A MOV 31H, A MOV A, #00H XCHD A, @R1 MOV 32H, A MOV A, @R1 SWAP A ADD A, #10 MOV 33H, A RET WUWEI: MOV R1, #34H MOV R0, #35H MOV A, #00H XCHD A, @R0 MOV 31H, 一 MOV A,R0 交换 添加,# 10 MOV
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