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微型计算机用于测量、数据处理和工业控制时,外围接口电路的设计十分重要.由于应用的具体情况和外围设备的不同,接口电路的方式也不同.目前国产的微型机外围电路片芯品种还不完善,有八位并行输入/输出接口5212(还有同类的SB8212等片芯),时序译码器5205,4位双向总线驱动器5216等.其中5212是主要的外围接口电路.虽然5212电路部分性能还不及美国Intel8080微处理机系统相应的8212电路,但由于容易买到,价格较低,因此掌握以5212电路为中心的外围接口电路设计原理是很有用的.以下谈的接口原理不仅适用于国产051微型计算机,也完全适用于Intel8080系统.
Micro-computer for measurement, data processing and industrial control, the design of peripheral interface circuit is very important. Due to the specific circumstances of the application and peripheral devices, the interface circuit is also different ways. At present, the microcomputer microchip peripheral chip core species Imperfect, there are eight parallel input / output interface 5212 (there is SB8212 chip core of the same kind), timing decoder 5205, 4 bit bi-directional bus driver 5216, etc. Among them, 5212 is the main peripheral interface circuit.Although 5212 circuit part The performance is not as good as the corresponding Intel 8280 microprocessor system Intel 8280 circuit, but because of easy to buy, lower prices, so to master the 5212 circuit as the center of the peripheral interface circuit design principles are useful. The following talk about the interface principle applies not only Domestic 051 microcomputer, also fully applicable to Intel8080 system.