帮朋友写的一个用MCS-51的IO口模拟PWM使外接LED亮度渐变的程序,虽然程序小,不过注释清楚,并已调试OK。-written for a friend with a MCS-51 simulation of the IO mouth so that external PWM LED brightness gradual process Although procedures for small, but clearly Notes, and debugging OK.
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