Monolithic microcomputers are simply referred to as single-chip microcomputers. In short, they are devices that integrate CPU (computing, control), RAM (data storage - memory), ROM (program storage), input/output devices (serial, parallel, etc.) and interrupt systems in the same chip. In our own personal computers, CPUs, RAM, ROM, and I/O are separate chips. These chips are then installed on a motherboard. This constitutes our PC motherboard, which is then assembled into a computer. The MCU just puts all this on one chip.
The most widely used 8-bit MCU is certainly the easiest microcontroller for beginners to learn. It was first introduced by Intel. Due to its typical structure and perfect bus-specific register centralized management, numerous logic bit operation functions and rich control-oriented The instruction system, which can be called a generation of "classic", laid the foundation for the development of other SCMs in the future.
The 51-chip microcomputer has become a classic, has become the easy to use microcontroller has the following characteristics:
51 microcontroller features1. From internal hardware to software, there is a complete set of bit-oriented operating systems, called bit processors, which deal with objects that are not words or bytes but bits. It can not only process certain bits of certain special function registers on the chip, such as transfer, set, clear, test, etc., but also perform bit logic operation. Its function is very complete and it is easy to use.
2. At the same time, a dual-function address range has been specially opened in the on-chip RAM section, which is extremely flexible. This function undoubtedly provides users with great convenience.
3, multiplication and division instructions, which also brings convenience to programming. Many 8-bit microcontrollers do not have multiplication functions, and they have to be programmed with a subroutine call for multiplication. This is very inconvenient.
51 SCM disadvantages1, AD, EEPROM and other functions need to rely on expansion, increase the burden on hardware and software
2. Although the I/O pin is easy to use, it has no output capability at high level. This is also the biggest weakness of the 51 series microcontrollers.
3, the operation speed is too slow, especially the double data pointer, if can improve can bring great convenience to programming
4,51 poor protection, it is easy to burn chips
51 microcontroller applicationAt present, a large number of occasions are used in teaching occasions and occasions where performance requirements are not high.
Most used devices: 8051, 80C51
The STMicroelectronics STM32 series microcontrollers introduced by ST manufacturers, the industry's friends all know that this is a series of high-performance microcontrollers, should not have one, the function and its powerful. It is based on an ARM Cortex-M core specifically designed for embedded applications that require high performance, low cost, and low power consumption. It also features state-of-the-art peripherals: 1 μs dual 12-bit ADC, 4 megabits/second UART, 18 Mbits per second SPI, etc., have good performance in terms of power consumption and integration, of course, compared with the MSP430's power consumption is slightly less than some, but this does not affect the engineers are eager to it, Because of its simple structure and easy-to-use tools, its powerful features are well-known in the industry... Its powerful features are:
STM32 microcontroller features1. Core: ARM32-bit Cortex-M3 CPU, maximum operating frequency 72MHz, 1.25DMIPS/MHz, single-cycle multiplication and hardware division
2. Memory: 32-512KB of Flash memory is integrated on the chip. 6-64KB of SRAM memory
3, clock, reset and power management: 2.0-3.6V power supply and I / O interface drive voltage. POR, PDR, and programmable voltage detector (PVD). 4-16MHz crystal oscillator. Embedded 8MHz RC oscillator circuit calibrated before shipment. Internal 40 kHz RC oscillator circuit. PLL for the CPU clock. 32kHz crystal with calibration for RTC
4. Debug mode: serial debugging (SWD) and JTAG interface. Up to 112 fast I/O ports, up to 11 timers, and up to 13 communication interfaces.
STM32 commonly used devicesThe most used devices: STM32F103 series, STM32 L1 series, STM32W series.
The 51 single-chip microcomputer is the collective name for all the microcontrollers compatible with the Intel 8031 ​​instruction system. The ancestor of this series of single-chip microcomputers is the Intel 8031 ​​single-chip microcomputer. Later, with the development of the flash ROM technology, the 8031 ​​microcontroller has made great progress and become the most widely used 8bit. One of the MCUs, his representative model is ATMEL's AT89 series.
The STM32 MCU is a 32-bit MCU manufactured by ST (STMicroelectronics) using the arm company's cortex-M3 as the core. His internal resources (registers and peripheral functions) are much higher than the 8051, AVR, and PIC. Basically close to the computer's CPU, suitable for mobile phones, routers and so on.
Orange soap with a clean, dried on the skin of course, is to remove the dirt dirt, skin secretions, excretions, chemicals or bacteria, etc. In today's emphasis on cosmetic results, remove the skin surface of cosmetics, skin care products or drugs is also a major one uses. Because in Orange soap he added perfume lotus, so have a navel orange aroma and also with the aroma of lotus.
Companies registered capital of 35 million yuan, the end of 2014 the total assets of 48.69 million yuan, including fixed assets of 37.52 million yuan. The company's existing cooperation Orange cultivation base 7043.5 acres, the company production base is located in Jiangxi County Tech Industrial Park Chu Tan industrial area, covers an area of 120 acres, it has built a standard plant 9,000 square meters, Nissan 6000 kg Orange enzymes and other liquid enzyme products. Enzyme, known as enzyme, refers to a polymer substance having biocatalytic functionality. In the catalytic reaction system an enzyme, the reactant molecules are known as substrates, enzyme substrates by catalytic conversion to another molecule. Almost all cellular activity of enzymes involved in the process are required to improve efficiency. Similar to other non-biological catalysts, enzymes chemical reactions by lowering the activation energy to accelerate the rate of the reaction, most of the enzyme catalyzed reaction rate can be increased a million times; in fact, the enzyme is to provide an activation energy needs than another low way, so that more particles to have less than the activation energy of the reaction kinetic energy, thus speeding up the reaction rate. Enzyme as a catalyst, in itself is not consumed during the reaction, it does not affect the chemical equilibrium reactions. Positive enzyme catalysis, but also a negative catalytic effect, not only to accelerate the reaction rate, but also to reduce the reaction rate. And other non-living catalysts is different, having a high degree of specificity of enzyme, only a catalytic reaction or produce a particular specific configuration.
Orange Enzyme Hand Soap,Pure Artificial Production Hand Soap,Orange Lotus Aromas Hand Soap
Guangdong ganzhou , https://www.tlqcjs.com