PD控温程序（汇编）

                               MOV   A,BCPCHH
                               MOV   SCPCHH,A
                               JB    BLPCFH,MLLP1232        ;将本次偏差数值与符号赋给上次保存地址
                               CLR   SCBLPCFH
                               JMP   fool2
MLLP1232:
                               SETB  SCBLPCFH
                               jmp   fool2

JSSZ2:                         CLR   C                       ;e(t)>0    e(t-1) <0
                               MOV   A,BCPCHL               ;计算e(t)-e(t-1) 的结果，存入PCWFL,PCWFH中
                               ADDC  A,SCPCHL
                               MOV   PCWFL,A
                               MOV   A,BCPCHH
                               ADDC  A,SCPCHH
                               MOV   PCWFH,A
                               CLR   WFPCFH
                               JMP   AOOL1

JSSZ1:                         CLR   C                   ;到此为止，本次e(t) 值已算出，并有符号位，可判正负%%%%%%%%%%%%%%%%%%%%%%%
                               MOV   A,BCPCHL            ;计算e(t)-e(t-1) 的结果，存入PCWFL,PCWFH中
                               SUBB  A,SCPCHL           ;e(t)  e(t-1) 都为正值
                               MOV   PCWFL,A
                               MOV   A,BCPCHH
                               SUBB  A,SCPCHH
                               MOV   PCWFH,A
                               CLR   WFPCFH
                               JNC    AOOL1               ;本次偏差>上次偏差，转走
                               SETB   WFPCFH              ;微分偏差符号置位
                               CLR    C
                               MOV   A,#0FFH
                               SUBB  A,PCWFL             ;本次偏差<上次偏差，求补锝实际数值
                               MOV   PCWFL,A
                               MOV   A,#0FFH
                               SUBB  A,PCWFH
                               MOV   PCWFH,A

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本文关键字：程序  51单片机，单片机-工控设备 - 51单片机