Delay control subroutine commonly used in 51 single chip microcomputer

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Delay control by programming

1. The raising of a question

Through programming, the single-chip microcomputer produces a delay of about 10ms and about 0.5s respectively. The crystal oscillator frequency of single chip microcomputer is 12MHz. Because the crystal frequency of the single chip microcomputer is 12MHz, the time of one machine cycle of the single chip microcomputer is 1 μ s.

two。 Control program

(1) 10ms delay program.

The actual delay time of this program is: 1 + (1 × 2 × 250 × 2) × 20=10.061ms

(2) 0.5s delay program.

Description: in the program, the symbol "; program start *" is used to indicate the beginning of the program, the symbol "; program end *" is used to indicate the end of the program, and "; -" is used to separate the various stages of the program in order to make the program organized and intuitive. These symbols can be input into Keil μ Vision3 software to compile at the same time. The following procedures are the same.

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