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2024-12-30 07:55 本頁面
【正文】 function through the different procedure, particularly special unique some functions, this is other ponent needs to take the very big effort to be able to achieve, some are the flowered big strength is also very difficult to achieve. One is not the very plex function, if develops in the 50s with the US 74 series, or the 60s39。s CD4000 series these pure hardware do decides, the electric circuit certainly arc a big PCB board ! But if, if succeeded in the 70s with the US puts in the market the series monolithic integrated circuit, the result will have the huge difference. Because only the monolithic integrated circuit piles through you the procedure may realize the high intelligence, high efficiency, as well as redundant reliability The CPU is the key ponent of a digital puter. Its purpose is to decode instruction received from memory and perform transfers, arithmetic, logic, and control operations with data stored in internal registers, memory, or I/O interface units. Externally, the CPU provides one or more buses for transferring instructions, data, and control information to and from ponents connected to it. A microcontroller is present in the keyboard and in the monitor in the generic puter。 thus these ponents are also shaded. In such microcontrollers, the CPU may be quite different from those discussed in this chapter. The word lengths may be short, the number of registers small, and the instruction sets limited. Performance, relatively speaking, is poor, but adequate for the task. Most important, the cost of these m
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