利用优先编码器实现外中断扩展的快速响应研究

Use of external interrupt priority encoder to achieve the rapid response of expansion

针对MCS-51单片机只有2个外部中断源,而实际应用中现有的外中断源有时会不够用。在这种情形下,我们就必须对外部中断源进行扩展。通过采用优先编码器74LS148既实现了外部中断源扩展,又实现了外部中断源的快速中断响应,同时也实现了对所扩展的中断源的中断嵌套处理。

For the MCS-51 only two external interrupt sources, and the practical application of the existing external interrupt source is sometimes not enough. In this case, we must extend the external interrupt source. By using priority encoder 74LS148 not only to achieve an external interrupt source extension, and external interrupt sources to achieve a fast interrupt response, but also to achieve the expansion of the interrupt source interrupt nesting process.