1, it is easy to set the working mode of the chip through the software, the use of 8255A to connect external devices, usually do not need additional external circuits, simple and efficient.
2, Intel 8255A, a classic programmable parallel input/output (I/O) interface chip, with its unique design reveals the charm of parallel interface. This chip is composed of four key parts: Data bus buffer: as the core of data transmission, ensure the smooth flow of high-speed data.
3,It is a microcomputer parallel interface chip. The 8255 is a programmable I/O port expansion chip. Input different instructions to the 8255 can change the way the I/O interface works. The connection between 8255 and MCU system is simple, and the working mode is set by the program. Figure 2 is the pin diagram of 8255.
4, the four addresses are: base site, base site base site 2 and base site 3. The 8255 is a parallel interface chip commonly used for computer hardware expansion. It has three 8-bit parallel I/O ports, as well as a control register. In order to access these functions, 8255 needs to assign four independent I'sIt can be successful, so slowly debug it, it will not be bad, but too many chips will be bad, depending on the data of the chip.
will lead to too much current, will burn electrical appliances, the voltage is too high will exceed the voltage of electrical components, breakdown components, resulting in damage to components. The current is too large, exceeding the carrying capacity of the appliance, and it will also burn the appliance and components. Any electrical appliances need to be used in accordance with the requirements of the manual, not over voltage and over current.
The current is not big. But I can't find the reset button. Where is it? In addition, the resistance at the diode end of the photocoupling is a little smallAccording to a value, the conduction current is approximately 10mA, too large, the conduction current takes 2 to 3mA, and the resistance is changed to 5K or 2K.
will certainly have an impact, will affect the service life, the current is too large will burn components, in addition, the disk, storage, etc. will have an impact, the voltage is too low will not identify what the U disk, it is best to use the original, want to quickly change the new computer, do not care.
However, within two years, if the battery capacity does not decrease significantly, the loss caused by fast charging can be basically accepted. The three major fatal factors that lead to battery acceleration damage are nothing more than high temperature and high pressure, and current instabilityOvercharge and overload. Among them, the problem of current instability as long as the original charger is guaranteed, do not worry too much.
Im (average output current), the maximum output current that can be continuously provided to support the peak specific load, the maximum peak current Ip (maximum peak output current); The maximum input and output current that a power supply supporting peak load can provide for a specified period of time. (Pay attention to the use conditions, do not work for a long time at the peak current).
osu! It is a very popular rhythm tourIn the play, osu pc refers to the osu client whose operating system is Windows. osu pc offers a smoother gaming experience, and it has a wider audience in the community.
pc is the meaning of playing computer network between men and women to play pc generally refers to playing computer together, online to play pc games or other activities; It is also possible to accidentally reverse the two letters pc, if cp, which refers to the meaning of a pair between men and women.
pc is a short form of piece. 1pc is the meaning of one, one etc. pcs is pAbbreviated form of ieces. pieces is the plural form of piece. PCS is an English abbreviation of a unit, which is widely used in import and export product business units.
1, programmable logic is PLC. programmable logic device English full name: programmable loThe gic device is a PLD. PLD is produced as a general integrated circuit, and its logic function is determined according to the user's device programming. The integration degree of general PLD is high enough to meet the needs of designing general digital systems.
2, called FPGA, with the MCU is not a thing. Logic devices can be classified into two main categories - fixed logic devices and programmable logic devices. True to its name, the circuits in fixed logic devices are permanent, they perform one or a set of functions - and once manufactured, they cannot be changed.
3, second, twoThe programming is different. Single-chip programming requires assembly language or C language, the difficulty will be relatively large. The system program is solidified in PLC, and only needs to use the corresponding programming language, which is simple and easy to learn, so the programming is relatively simple.