通用延时子程序的应用

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                    DELY］:通用延时子程序
［地址］:7FEBH?-?FFEBH
［功能］:延时
［入口］:延时常数放在R2寄存器中。时间常数N(十六进制)所对应的延时时间(6MZH晶振时)见下表:
［出口］:R2=0
［占用寄存器］:R2
［调用］:无
例:延时1秒子程序
MOV?R2,#18H
LCALL?7FEBH
RET

ORG?7FEBH?通用延时子程序(07EBH?&?0FEBH?&?...)
L7FEB:?PUSH?02H?R2(复位后R2即为02H)存放时间常数,进栈保护
L7FED:?PUSH?02H??R2进栈保护
L7FEF:?PUSH?02H??进栈
L7FF1:?DJNZ?R2,$?R2不为零等待
POP?02H?出栈
DJNZ?R2,L7FEF??R2不为零转
POP?02H??出栈
DJNZ?R2,L7FED??R2不为零转
POP?02H??出栈
DJNZ?R2,L7FEB??R2不为零转
RET?子程序返回
END
N(十六进制数)T(机器周斯)T(秒)?子程序地址
1?11?0.000044?
C?2728?0.010912?
18?26323?0.105292?2800
1D?50838?0.203352?2808
21?80323?0.321292?2810
24?109666?0.438664?2818
26?133248?0.532992?2820
28?160431?0.641724?2828
29?175481?0.701024?2830
2E?267146?1.068584?2838
37?516836?2.067344?2840
3D?760366?3.041464?2848
42?1021681?4.086724?2850
46?1275016?5.100064?2858
54?2543878?10.175512?2860
65?5144436?20.577744?2868
70?7654053?30.616212?2870
78?9986491?39.945964?2878
7F?12432158?49.728632?2880
98?24956083?99.824332?2888
A9?37708623?150.83453?
B6?50353668?201.41467?2890
CA?75697683?302.79073?2898
D9?100218410?400.87365?28A0
E6?125909940?503.63974?28A8
F1?151248830?605.03532?28B0
FF?188839490?755.35794?
0?191768000?767.072?28B8
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