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我在使用2808DSP的过程中,参考了TI的移相全桥程序,其中PI控制部分汇编程序中使用了一个叫做forced substitution的用法,具体用法是:x:,我查看了官方解释,但是没看明白,有没有熟悉它的人给详细解释一下其用法,谢谢