【正文】 mand byte), PC will automatically increase the content of 1 to point to the next instruction address, so that the implementation of directives to the order. Encountered only when the transfer of mand procedures, subroutine call instructions, or face failure (after the introduction), PC only go where needed. 8051 CPU 碢 C39。 single chip can implement all the mands, the mand is the singlechip system (Iustruction Set), different types of singlechip, and its mand system is also different. The use of singlechip, the prior should be the problem to be solved into a series of mands. These instructions must be selected to identify and implement singlechip instructions. Singlechip customers to solve their own problems by the instructions for the procedure, known as source code (Source Program). Usually divided into opcode instruction (Opcode) and operand (Operand) of two major parts. Operation of the puter code that the implementation of any operation, that is, the function of mand。 the third step: add。 34, then it results from a minus, it has been the final oute. Now, we use singlechip to plete the process, it is clear that it should be instead of thinking first of all the ponents for puting, which is the calculator。英文翻譯 Singlechip ponents To autoplete singlechip basis, it should be the most important part of what it? Calculated as an example we calculate on an abacus math problems together. Cases: 36 +163 156166 247。 34. Now to carry out operations, first of all need a plan, followed by Pen and paper. We have to calculate the issue of record, and then count the first step, 163 156, add it with the results of 36 recorded in the paper, and then calculate 166 247。 Secondly, there must be able to play the role of devices, which can remember the original subject, the raw data and intermediate results, but also remember to enable singlechip operation can be automatically prepared by the various orders. These devices called memory. In addition, the need to replace the role of the controller, it will be in accordance with an order prior to issuing various control signals so that the whole process can be calculated step by step manner. However, this threepart light enough, the original data and mands to be input, the results of the calculation to the output, are required by the order in which they sometimes need to wait. The first step: the first number from its storage unit (Location) in the check out to the puting device. Step two: the second number from its storage unit in the check out to the puting device。 fourth step: End the sum of the results to the specified memory unit. All of these take a number, send a few, the sum of deposit, etc. are a few operations (Operation), we asked the puter to operate with the implementation of the various forms of writing down the order, which is instruction. But how can we identify them and to perform these operations? This is a single chip in the design by the designers of the instruction given to it by decision. A mand, corresponding to a basic operation。 operand that participate in the operation or operand address is located (that is, the operand stored in the local code). Because the single chip is a programmable device, only recognize the binary code (0,1). Operation to singlechip, singlechip microputer system in all directions, must be the form of binary code to represent. For example, in Intel39。s designated address, the corresponding unit from the ROM mand byte out of storage on the instruction register, and then, in the instruction register decoder instruction code has been translated into various forms of control signals, these signals with a single Machine clock oscillator clock pulse generated in the timing and control circuit in bination to form a certain period of time according to changes in level and beat the clock, the socalled control of information, internal coordination in the CPU data transfer between registers, and other puting operation. A program memory Control puter program is a series of action mands, singlechip only recognized by the 0 and 1 consisting of machine code instructions. Such as