1, is designed to: The use of MCS-51 microcontroller and related chips constitute a simple cash register. 2, design requirements: System to achieve the following functions: ⑴ with a scalable digital and "+","×","=" keyboard for input. ⑵ can be recycled to achieve a single user consumption, the total amount of calculations. ⑶ a reset, single-step returns and displays the decimal expansion of functions.

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