Question

汇编语言延时 push pop

ORG 0630H
HA4S: MOV SP,#60H
MOV DPTR,#0FF2BH
MOV A,#80H
MOVX @DPTR,A
MOV DPTR,#0FF29H
MOV A,#49H
MOVX @DPTR,A
INC DPTR
MOV A,#49H
MOVX @DPTR,A
MOV R2,#25H
LCALL DELAY
HA4S3: MOV DPTR,#0FF29H
MOV A,#08H
MOVX @DPTR,A
INC DPTR
MOV A,#61H
MOVX @DPTR,A
MOV R2,#55H
LCALL DELAY
MOV R7,#05H
HA4S1: MOV DPTR,#0FF29H
MOV A,#04H
MOVX @DPTR,A
INC DPTR
MOV A,#51H
MOVX @DPTR,A
MOV R2,#20H
LCALL DELAY
MOV DPTR,#0FF29H
MOV A,#00H
MOVX @DPTR,A
INC DPTR
MOV A,#41H
MOVX @DPTR,A
MOV R2,#20H
LCALL DELAY
DJNZ R7,HA4S1
MOV DPTR,#0FF29H
MOV A,#03H
MOVX @DPTR,A
INC DPTR
MOV A,#0cH
MOVX @DPTR,A
MOV R2,#55H
LCALL DELAY
MOV R7,#05H
HA4S2: MOV DPTR,#0FF29H
MOV A,#02H
MOVX @DPTR,A
INC DPTR
MOV A,#8aH
MOVX @DPTR,A
MOV R2,#20H
LCALL DELAY
MOV DPTR,#0FF29H
MOV A,#02H
MOVX @DPTR,A
初始状态0为东西红灯，南北红灯。然后转状态1东西绿灯通车，南北红灯。过一段时间转状态2，东西绿灯灭，黄灯闪烁几次，南北仍然红灯。再转状态3，南北绿灯通车，东西红灯。过一段时间转状态4，南北绿灯灭，闪几次黄灯，延时几秒，东西仍然红灯，最后循环至状态1。
INC DPTR
MOV A,#08H
MOVX @DPTR,A
MOV R2,#20H
LCALL DELAY
DJNZ R7,HA4S2
LJMP HA4S3
DELAY: PUSH 02H
DELAY1: PUSH 02H
DELAY2: PUSH 02H
DELAY3: DJNZ R2,DELAY3
POP 02H
DJNZ R2,DELAY2
POP 02H
DJNZ R2,DELAY1
POP 02H
DJNZ R2,DELAY
RET
END
小白，交通灯设计程序 请问 红绿灯持续 和 黄灯闪烁 各多少秒？如何计算？谢谢。

Answer 1

DELAY: PUSH 02H ;1*R2
DELAY1: PUSH 02H ;1*R2*R2
DELAY2: PUSH 02H ;1*R2*R2*R2
DELAY3: DJNZ R2,DELAY3 ;2*R2*R2*R2*R2
POP 02H ;1*R2*R2*R2
DJNZ R2,DELAY2 ;2*R2*R2*R2
POP 02H ;1*R2*R2
DJNZ R2,DELAY1 ;2*R2*R2
POP 02H ;1*R2
DJNZ R2,DELAY ;2*R2
RET ;2
总延时时间为2*（R2）^4+4*(R2)^3+4*(R2)^2+4*(R2)+2
当R2=20H时，延时约为2.2秒
当R2=25H时，延时约为4秒
当R2=55H时，延时约为107秒