Programmable Interval Timer (Programmable Interval Timer, PIT, 8253 or 8254 model), also known as the system clock, is a very useful chip in a certain time interval can be accurately generate an interrupt. Chip itself has three channels: channel 0 bound to IRQ0, and rules in the foreseeable time interrupt CPU channel 1-specific systems 2-channel speaker connected to the system. As you see, like a single chip for the system provides several important services.

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可编程间隔定时器.htm

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