Calendar and clock display interface circuit

　　As shown in the figure, it is composed of EEPROM24C256 and calendar clock chip PCF8563 . 24C256 is a low-voltage, serial interface, memory with a capacity of 256K, used to store measured blood pressure values. PCF8563 is an industrial-grade multi-function clock/calendar chip with extremely low power consumption that contains an I2C bus launched by PHILIPS. Used to provide the time and date when blood pressure was measured for future query use. It is convenient for users to have a clear memory of their blood pressure over a period of time. It is highly practical and overcomes the shortcomings of some electronic blood pressure monitors.