51 Singlechip to do with a simple frequency meter, KEIL C environment, with project file can be directly compiled to run. The main demonstration of how little memory, can not be enabled MCU RTOS (eg 2051) the use of state machine and the time slice to complete the real-time multi-task parallel processing. examples of the keyboard, signal acquisition and digital tube LED display of the three parts of a parallel processing, which is only used in single-chip 256-byte of the 2K ROM memory 89C2051.

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