This document is about the commonly used peripheral device interface circuit diagrams for single-chip microcomputers. It mainly includes the following circuits: LED digital tube and encoding method Static display method and its typical application circuit Dynamic display method and its typical application circuit Virtual I2C bus serial display circuit Keyboard de-jitter and connection and control method Independent key and its interface circuit Matrix keyboard and its interface circuit Parallel A/D ADC0809 and its interface circuit Serial A/D ADC0832 and its interface circuit I2C serial A/D typical application circuit DAC0832 and its interface circuit I2C serial D/A typical application circuit Switching quantity drive output interface circuit
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