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TimerMatchSet(TIMER0_BASE, TIMER_A,0);这样来关断，会不会 有一个 Pulse呢 ？如果我的PWM 是 20K Hz，会不会 看似关断了，实际上 有 20K Hz的pulse 呢 ？The output PWM signal asserts when the counter is at the value of the GPTMTnILR and GPTMTnPR registers (its start state), and is deasserted when the counter value equals the value in the GPTMTnMATCHR and GPTMTnPMR registers.
