dsp c5517 外部中断0在使用的过程中 我发现它是低电平触发,
我现在INT0管脚连接到fpga上, fpga给INT0的时序是 高电平---低电平 ,低电平持续5ns,又变成高电平,我发现dsp有的时候捕捉不到下降沿中断, INT0响应中断具体要求是什么?
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5ns 太小,请问你的5517 是运行主频是多少,要满足的条件是:低电平要大于2P
下面是P的介绍:
P = 1/SYSCLK clock frequency in ns. For example, when the CPU core is clocked at 100 MHz, use P = 10 ns. For example, when the CPU core is clocked at 175 MHz, use P = 5.71 ns