The series of MCS-51 Single Chip Microcomputer(SCM) only have two external interrupts. Two common methods for the extension of external interrupts are introduced. It also specifies the program of interrupt's priority by assemble language.In order to withdraw the interrupts triggered by level, a available scheme with combination of hardware and software is given. Another available scheme is given,which is about port reuse technology,because the resource of I/O in the series of MCS-51 is too limited.It also analyzes these schemes according to circuit schematic diagram.
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许哲 张伯珩 边川平 许曼. 单片机外部中断的扩展[J]. 科学技术与工程, 2007, (19): 5116-5119. XU Zhe, ZHANG Bo-heng, BIAN Chuan-ping, et al. External Interrupt Extension for Single Chip Microcomputer[J]. Science Technology and Engineering,2007,(19):5116-5119.