CN219457000U - Study and development board based on STC89C52 singlechip - Google Patents

Abstract

The utility model discloses a study and development board based on an STC89C52 singlechip, which comprises the STC89C52RC singlechip, a USB interface, a USB-to-UART circuit, a 3.3V voltage stabilizing chip, a nixie tube, a buzzer, a screen interface, an LED indicator lamp, a user key and an expansion GPIO interface. The nixie tube, the buzzer, the screen interface, the LED indicator lamp, the user key and the extended GPIO interface are respectively connected with the STC89C52RC singlechip. The utility model has high integration level of each element, so that the product has smaller appearance volume and is convenient to use and install. The USB interface is used for supplying power, so that power supply equipment for supplying power to the product can be easily found; the portable electronic device has multiple peripheral functions, such as a digital tube, an indication LED, a user key, a buzzer and the like. The user may programmatically control the peripheral to achieve the desired function.

Description

Study and development board based on STC89C52 singlechip

Technical Field

The utility model relates to the technical field of singlechips, in particular to a study and development board based on an STC89C52RC singlechip.

Background

STC89C52RC is a low-power consumption, high-performance 51-kernel CMOS 8-bit singlechip, has an online programming function, does not need to start 12V VPP programming high voltage like STC89C51, and is simple to use and quite low in cost. Many universities use this type of single-chip microcomputer as a teaching example to set up microcontroller courses. The chip cannot work as an independent circuit, so that the STC89C52RC singlechip study and development board which is simple and easy to use and small in size becomes an indispensable tool for a developer.

Today, where technology is widely developed, the development of computers has become faster and faster, and his applications have become more and more widespread. Development and application of two singlechips are important aspects. The single chip microcomputer has wide application in industrial production (electromechanical, chemical, light spinning, automatic control and the like) and domestic household appliances. Wherein, the application of the singlechip in industrial production is particularly wide. The single chip microcomputer has the advantages of high integration level, high processing capacity, high reliability, simple system structure and low price, and is widely applied. At present, single chip microcomputer is widely applied in various fields of industrial control systems. Especially, the C51 series singlechip has good stability and high operation precision, promotes industrial production, and influences the work and study of people. Whereas the conventional STC89C52 development board has the following problems:

1. the product has larger volume and is inconvenient to carry in daily life.

2. A dedicated power supply is required for the power supply.

3. It is necessary to download using a dedicated downloader.

4. Some commercial products lack functionality or cannot switch the master clock crystal conveniently.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a study and development board based on an STC89C52 singlechip.

The aim of the utility model is realized by the following technical scheme:

the study and development board based on the STC89C52 singlechip comprises the singlechip, a power supply module, various external devices and a plurality of data interfaces; the singlechip is electrically connected with the power module, various external devices and a plurality of data interfaces respectively.

The singlechip specifically adopts an STC89C52RC singlechip.

The data interface includes a GPIO interface and a screen interface.

The external equipment comprises a nixie tube, an LED indicator light, a buzzer and a user key.

The power module comprises a USB interface, a USB-to-UART circuit, a 3.3V voltage stabilizing circuit and a 3.3V power interface; the output end of the USB interface is respectively and electrically connected with the input end of the 3.3V voltage stabilizing circuit, the input end of the USB-UART converting circuit, the singlechip and the screen interface; the output end of the 3.3V voltage stabilizing circuit is electrically connected with the input end of the 3.3V power interface; the output end of the USB-UART converting circuit is electrically connected with the singlechip.

The utility model has the beneficial effects that:

1. the integration level of each element is high, so that the product has smaller appearance volume and is convenient to use and install;

2. the USB interface is used for supplying power, so that power supply equipment for supplying power to the product can be easily found;

3. the portable electronic device has multiple peripheral functions, such as a digital tube, an indication LED, a user key, a buzzer and the like. The user may programmatically control the peripheral to achieve the desired function.

4. With two screen interfaces, a 0.96 inch OLED, or LCD1602 screen can be attached. For performing functions such as data display.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a structural connection diagram of the present utility model;

FIG. 2 is an electrical schematic of the present utility model;

fig. 3 is an enlarged view of a portion a of fig. 2;

fig. 4 is an enlarged view of a portion B of fig. 2;

fig. 5 is an enlarged view of a portion C of fig. 2;

fig. 6 is an enlarged view of the portion D of fig. 2.

Detailed Description

Other advantages and advantages of the present utility model will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, in the description of the present utility model, terms such as "medium," "upper," "lower," "transverse," "inner," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

As shown in fig. 1-6, the technical problem to be solved by the utility model is to provide an STC89C52 singlechip learning and developing board for overcoming the inconvenience caused by the need of manually replacing a master clock crystal oscillator, needing a separate power supply and using a special downloader in the prior art.

STC89C52 is a low power consumption, high performance CMOS8 bit microcontroller with 8K in system programmable Flash memory. On a single chip, the system has a smart 8-bit CPU and a system programmable Flash, so that the STC89C52 provides a highly flexible and super-effective solution for a plurality of embedded control application systems. The technical scheme adopted by the utility model is as follows: study and development board based on STC89C52 singlechip, including STC89C52RC singlechip, USB interface, USB changes UART circuit, 3.3V steady voltage chip, charactron, buzzer, screen interface, LED pilot lamp, user's button, expansion GPIO interface.

The nixie tube, the buzzer, the screen interface, the LED indicator lamp, the user key and the extended GPIO interface are respectively connected with the STC89C52RC singlechip.

In one embodiment, the USB-to-UART circuit is connected to a data line in the USB interface.

In one embodiment, the USB interface may provide 5V power for the entire development board, and the 5V power is converted into 3.3V through the 3.3V voltage stabilizing chip, so as to provide power for the 3.3V power expansion interface.

The STC89C52RC singlechip is used as a main control chip and is a universal 80C51 kernel singlechip, the speed of the singlechip is 1T, and the working voltage is 5V. The 80C51 kernel singlechip belongs to MCS-51 series singlechips, is developed by Intel corporation, has the structure of 8048 extension, improves the defects of 8048, and increases instructions such as Multiplication (MUL), division (DIV), subtraction (SUBB), comparison (CMP), 16-bit data pointer, boolean algebra operation and the like, serial communication capability and 5 interrupt sources. A40 pin dual inline DIP (Dual In Line Package) is used with a 128Byte RAM cell and a 4K ROM. Because the device has the 80C51 kernel with original taste and flavor, development data matched with the device is very rich, and a developer can conveniently acquire development data shared by other developers from the Internet, so that development difficulty is reduced.

The 3.3V voltage stabilizing chip is SPX1117-33.SPX1117-33 is LDO type power supply voltage stabilizing chip, and the maximum output current is 1000mA. A sufficient and stable power supply can be provided for the peripheral.

SPX1117 is a low power forward voltage regulator that may be used in some high efficiency, small package, low power designs. The device is very suitable for portable computers and battery-powered applications. SPX1117 has a very low quiescent current with a low voltage differential of only 1.1V at full load. When the output current decreases, the quiescent current varies with the load and increases efficiency. SPX1117 is adjustable to select output voltages of 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, and 5V. SPX1117 provides a variety of 3-pin packages, S0T-223, T0-252, T0-220, and T0-263. An output capacitance of 10uF is effective in ensuring stability, however in most applications only a smaller 2.2 uF capacitance is required.

The nixie tube is a 4-bit decimal point nixie tube, and the 4-bit decimal point digital can be displayed through program control.

The screen interfaces include an OLED interface and an LCD1602 interface. The user can connect different screens according to own needs.

The user keys comprise 6 GPIO keys controlled by a user and a reset key. The user may configure the functions of the user keys through a program.

The foregoing is merely a preferred embodiment of the utility model, and it is to be understood that the utility model is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims (2)

1. The study and development board based on the STC89C52 singlechip is characterized by comprising the singlechip, a power supply module, various external devices and a plurality of data interfaces; the singlechip is respectively and electrically connected with the power supply module, various external devices and a plurality of data interfaces; the data interface comprises a GPIO interface and a screen interface; the screen interface comprises an OLED interface and an LCD1602 interface;

the external equipment comprises a nixie tube, an LED indicator lamp, a buzzer and a user key; the user keys comprise 6 GPIO keys controlled by a user and a reset key;

the power module comprises a USB interface, a USB-to-UART circuit, a 3.3V voltage stabilizing circuit and a 3.3V power interface; the output end of the USB interface is respectively and electrically connected with the input end of the 3.3V voltage stabilizing circuit, the input end of the USB-UART converting circuit, the singlechip and the screen interface; the output end of the 3.3V voltage stabilizing circuit is electrically connected with the input end of the 3.3V power interface; the output end of the USB-UART converting circuit is electrically connected with the singlechip.

2. The learning and developing board based on the STC89C52 singlechip as set forth in claim 1, wherein the singlechip is a STC89C52RC singlechip.