［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

MOVR2,#18H

LCALL 7FEBH

RET

ORG7FEBH;通用延时子程序(07EBH & 0FEBH & ...)

L7FEB:PUSH02H;R2(复位后R2即为 02H)存放时间常数,进栈保护

L7FED:PUSH02H; R2 进栈保护

L7FEF:PUSH02H; 进栈

L7FF1:DJNZR2,$;R2 不为零等待

POP02H;出栈

DJNZR2,L7FEF; R2 不为零转

POP02H; 出栈

DJNZR2,L7FED; R2 不为零转

POP02H; 出栈

DJNZR2,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

1110.000044

C27280.010912

18263230.1052922800

1D508380.2033522808

21803230.3212922810

241096660.4386642818

261332480.5329922820

281604310.6417242828

291754810.7010242830

2E2671461.0685842838

375168362.0673442840

3D7603663.0414642848

4210216814.0867242850

4612750165.1000642858

54254387810.1755122860

65514443620.5777442868

70765405330.6162122870

78998649139.9459642878

7F1243215849.7286322880

982495608399.8243322888

A937708623150.83453

B650353668201.414672890

CA75697683302.790732898

D9100218410400.8736528A0

E6125909940503.6397428A8

F1151248830605.0353228B0

FF188839490755.35794

0191768000767.07228B8