One of the pins is programmed to produce a constant 1000 KHz square wave using PIO. The main program then turns the PIO on and off at the intended frequency. e.g. to emit an A4 pitch (440 Hz), it turns the 1000 KHz square wave on and off 440 times a second. To the radio receiver, this means a 440 Hz square wave audio. Using this technique, it emits the well-known Shave and A Haircut melody on a loop.
第十一条 船舶抵押权，是指抵押权人对于抵押人提供的作为债务担保的船舶，在债务人不履行到期债务或者发生当事人约定的实现抵押权情形时，依法享有的就该船舶优先受偿的权利。
，详情可参考同城约会
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