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常见问答
GPIO中断与单一管脚中断(EINT)的使用时机为何? 日期:2018-01-16
由于GPIO中断与单一管脚中断寻找触发源所花的时间不同,因此在使用上,特别紧急的事件采用单一管脚中断,普通的事件则共享一组GPIO中断。 以M051为例,P0[7:0]与P1[7:0]这16根脚共享GP01_INT中断处理函数,当中断发生后需要轮询(polling)来寻找触发源,较花时间;EINT0则仅能由P3.2触发,因此不需要轮询,较省时间。
表一 M051中断脚位映射表
Interrupt Name |
Interrupt Description |
EINT0 |
External signal interrupt from P3.2 pin |
GP01_INT |
External signal interrupt from P0[7:0] / P1[7:0] |
产品: | 微控制器 ,8 位 8051 微控制器 ,Arm Cortex-M0 微控制器 ,Arm Cortex-M4 微控制器 |
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应用: | |
功能: | Peripherals,ARM,Interrupt,I/O,External Interrupt,GPIO |