A high-precision timing method for 51 single-chip microcomputer

Abstract

The invention relates to a high-precision timing method of a 51 singlechip microcomputer. The method is performed by consecutively reading a timer and appropriately shielding the timer, wherein consecutive two-time value reading of the timer solves timing errors due to lower 8-bit overflow carry-in of the timer; appropriate timer shielding in cooperation with timer overflow flag bit reading solves the timing errors due to lower 16-bit overflow carry-in of the timer, and accordingly high-precision timing of the 51 singlechip microcomputer is achieved. Meanwhile, the high-precision timing method of the 51 singlechip microcomputer is achieved simply through the timer in the 51 singlechip microcomputer instead of external complex timing circuits, thereby being relatively low in cost, simple, easy to achieve and highly practical.

Description

technical field [0001] The invention relates to a high-precision timing method of 51 single-chip microcomputers, belonging to the technical field of control. Background technique [0002] The control system with time as the control quantity is widely used in modern industrial production and manufacturing industry, so the high-precision timing function has become the premise of high-precision control. At present, the timing function of most high-precision control systems is through special Such as the article "Hardware Design of High-precision Wireless Strain Measurement System", authors: Zhang Shiming, Chen Weimin, Zhang Peng, Liu Xianming, Lei Xiaohua, "Sensors and Microsystems", 31(12), 2012. But there are obvious defects in this approach: the control system requires additional peripheral circuits and chips, which undoubtedly increases the complexity and cost of the system. [0003] Based on the smallest system of 51 single-chip microcomputer, it only uses one of its inte...

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Problems solved by technology

But there are obvious defects in this approach: the control system requires additional peripheral circuits and chips, which undoubtedly increases the complexity and cost of the system

However, simply using the timer of the 51 single-chip microcomputer cannot complete the high-precision timing function, because the timer of the 51 single-chip microcomputer does not have a latch function, so when the timer's lower 8-bit overflow carry and lower 16-bit overflow carry, it will give Timing caused a large error

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