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如何理解TMS320F2837xD中ADC模块的PPB过零检测功能。

在TI官方的数据手册中,有图1中这样一句话“Note that the PPBxZERO bit in the ADCEVTSTAT register is gated by EOC and not by the sign change in the ADCPPBxRESULT register.”这告诉我这个过零检测模块仿佛没有那么简单??但从结构框图上来看,并没有任何EOC信号引入到过零检测模块中。??

  • 我对gated by EOC的理解是,如果没有EOC信号,那么过零检测模块就不去检测ADCPPBxRESULT的值是否发生了符号变化。不知对不对?
  • 是的,个人认为可以这么理解。即PPBxZERO位(置位)可以用来表明ADCPPB4RESULT寄存器是否发生了符号改变,但是否启用这个位是由EOC信号选择的。