tory burch A multi-functional by the AT89C51 MCU i

A multi-functional by the MCU AT89C51 record of the monitor

Register decoder display a dynamic overview of timers in metallurgy and metallurgical control measure has been widely used, especially in the metallurgical process control, process control often on the precise timing of each session, the current market supply relatively high cost of the timer, GM is also hearing. We use AT89C51 microcontroller and related devices assembled a multi-function timer, keyboard input through the control of table tennis can be shown separately Beijing and the control process control section of each moment and each time, the use of P1 port I / 0 function can be equipped with PLC control of any signal or keyboard input, etc., through the analysis of their input to determine the need for time content. P1.0 ~ D1.3 can be output, timing control process. Figure 1i. . . f. . . . . . . ~. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. . . . . 0. . . . 0. . . . . 2. . . . . . . . N. . . . . . . o. . . . . . . -1-2 Second, the structure and principles 1. Structure of the time display to AT89C51 microcontroller as the core of the hardware architecture,[link widoczny dla zalogowanych], together with the 74LS273, 74LS139 chips and a G-FLED E20561 common form of digital control (see Figure 1) timing controller, the application deposited AT89C51-chip EPROM. 74LS273 is a three-state with a clear end of the eight D latches on the address by the P0 port output latch, the P0 port for the address / data three-state bidirectional data bus data is also provided by it. Address decoder LS139 decoding method using the whole address, it will address low-address as the chip, but with the decoder for decoding the high address lines, the address decoder output select line as the chip select lines. LlL2IJ3L4 for the display light, each lamp's light marks the moment of being displayed or control the process time, S1 is circular display key, each time, LED replacement of a display, the content of an indicator light replacement, s2s3 adjust the key for the time, with the two keys at any time adjust the Beijing time. P1.0 ~ P1.3 pin for keyboard or other input signals such as PLC to control the timing content. Display using software to scan the dynamic display, will all the bits together with the alignment segments, not only simplifies the circuit design and reduces costs. 2. AT89C51 works two 16-bit internal timer / counter, the use of its way to a timer mode, through the P1 port of the input signal, if P1.0 is 1, then put the stores in real-time clock of the storage unit the contents of a specific store to another storage unit (such as 50H51H),[link widoczny dla zalogowanych], to prepare for display purposes, and so, if the human input P1.2 1, then put the memory of this moment of real-time clock to a second special storage unit (such as 52H53H),[link widoczny dla zalogowanych], which is every moment of the timing function can also be done on the track record control process. If the beginning of a process, then a bit of memory (eg 60H) is set to 1, when the mark as the start record in time to join the main program to determine statements, until the whole process is finished, this bit is cleared and this register time process control section to a specific memory storage for future display subroutine calls, so that each process occurs not only record real-time clock, but also record the entire duration of the process to form a versatile timing system. After system initialization, the display shows real-time clock. Basic flow chart shown in Figure 2. Third, the conclusions of the AT89C51 to deal with this timing system centered over the crystal oscillator pad 2Q1 Figure 2 using 6MHz,[link widoczny dla zalogowanych], so timing accuracy (1/lOOs), the hardware circuit is simple,[link widoczny dla zalogowanych], CPU instruction set and the address assigned to people familiar with the 8031 such as CPU chips are fully compatible, program design and debugging facilities, control systems have been applied to a set of aluminum to good effect. References [1] Sun Han Fang, Xu Aiqing. Microcontroller Theory and Application. Beijing: Beijing Aerospace University Press, 1989. [2] Li Zhaoqing. SCM principles and interface technology. Beijing: Beijing Aerospace University Press, 1999.

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