MCU (Micro Controller Unit), also known as the A-chip micro-computer, or microcontroller. Refers to the emergence and development of LSI to the computer's CPU, RAM, ROM, timers, and a variety of I / O interface is integrated in a chip to form a chip-level computer. Although for the pushing power of the market for multi-function product margin increased demand and H, 32-bit MCU products increasingly become a hot market and the 16 MCU also occupy a certain market share, but the 8-bit MCU is still enough technology market mainstream, and the line of fairly broad application space, and a strong cattle vitality, the main reason is that there are a considerable number of applications Bjl need to use 8-bit microcontroller can meet the technical requirements o 8-bit single-chip low-cost, easy to develop technical resources and other posts microcontroller can not match its, therefore, whether the chip manufacturer or system application developers, eight single-chip status and development were given a great deal of concern o 8 Lun machine, in addition to MC B 51, 8 and 16 machine no acres of a standard or pre-standard production; product. 32-bit embedded processors - that applies only to the views of the high-end applications are changing the * more and more complex features and functional requirements of portable electronic devices are contributing to embedded systems engineers to consider to replace with 32-bit MCU 8 / 16 MLu. In addition, more and more design handsome recognize the switch to 32-bit architecture can not only improve performance, and can reduce system power consumption and conservation of the total cost of the same cost and shorten the time of products on the towel. This transformation provides designers can be with the of product performance and demand continues to expand and 7j-level program, allowing the rapid rise of the proportion of 32-bit embedded processor. First of all, is because digital cameras, MP3 shake so the machines, PDAs, game consoles and mobile phones and other handheld devices, and a variety of information appliances, such as the introduction of more high-performance requirements of multimedia and communications equipment. In these applications, a large multimedia data necessarily requires more storage space, many of the 32-bit microcontrollers can use SDRAM, so you can greatly reduce the cost of using larger capacity data memory: 8-bit microcontrollers are generally Use only the high cost of the ROM as a data memory. Practical needs. In addition. There are more and more like traditional applications such as televisions, car audio and electronic toys, the Ministry of ten times the digital hardware softening "of requirements, performance requirements of memory capacity needs are beyond the vast majority of 8 Lun micro-controller can provide ranges. Secondly, since the stare of technology development, 32 imitation of the ARM architecture has become a de facto standard hard with the high-end 32-bit CPU price is falling and mature servant environment, prompting the 32-bit embedded processors increasingly squeezed out of the original 8-bit microcontroller-driven applications space. Popular with the ARM processor on a global scale, the 32-bit RISC into the processor has started to become a high end embedded applications of the people and the mainstream of design.
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