MOVR2,A

DJNZR7,RE1

MOV60H,R2

RET

将内部RAM-50H~60F单元中无符号数按从小到大次序牌系列，结果仍放原储存空间

XCHA,R0

INCR0

SETBF0

BB1:DJNZR3,BB2

JNBF0,BB3

DJNZR7,BB4

BB3:RET

2.外部RAM4000H~401FH单元中内容为有符号数，将其中正数负数分别送到内部RAM80H和0A0H单元开始的地址，记下正数和负数的个数送60H和61H单元

MOVR7,#20H

MOVDPTR,#40000H

MOVR0,#80H

MOVRI,#0A0H

MOV60H,#00H

MOV61H,#00H

LOOP:MOVXA,DPTR

ACC.7,NEG1

MOVR0,A

INCR0

INC60H

SJMPMEXT1

NEG1:MOVR

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SUBBA,R6

JNCBB1

MOVA,R6

XCHA,R0

DECR0

BB2:MOVA,R0

MOVR6,A

INCR0

MOVA,R0

CLRC

3.统计学生成绩，有32名学生，成绩内部RAM30H-4FH，一个学生一个字节，该班平均成绩置60H

MOVR7,#20H

MOVR0,#30H

MOVR2,#00H

MOVR3,#00H

MOVR7,#1FH

BB4:MOVA,R7

MOVR3,A

CLRF0

MOVR0,#50H

MOVA,R3

RRCA

MOVR3,A

MOVA,R2

RRCA

RE:MOVA,R2

ADDA,R0

MOVR2,A

MOVA,R3

ADDCA,#00H

RET

CHAG:ANLA,#0FH

ADDA,#30H

MOVR1,A

TNCR1RET

MOVR3,A

INCR0

DJNZR7,RE

MOVR7,#05H

REI:CLRC

复习，请假，明天考试 (第2/3页)

WAPA

LCALLCHAG

INCR0

DJNZR7,RE

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