Design of LED Display Control System Based on AT89C52 ...

were used in the design, they work according to the order, the input of another piece of 74HC154 is P1.4 ~ P1.7 which is provided by AT89C52 to control screen. Figure.5. column scan unit circuit Figure.6. Serial Communication Interface Circuit D Serial Communication Interface Circuit PC and SCM are linked via a serial communication interface.

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