Function: use PCF8563T ZLG7290B chip and chip to display the time, be able to use a keyboard time parameters modification modification process can be echo , blinking , fault-tolerant , and using a buzzer system to achieve clock the chime First, the hardware connection 1, ZLG7290B chip SDA and SCK are connected to P1.0 and P1.1 analog IIC protocol, RST_L reset terminal connected to the P1.7 port to they reset operation 2, P1.6 connected buzzer for chime (about sound 2s) 3, the chip set is always CLKOUT output and the second pulse and P3.2 connection (for display refreshed every second), INT_KEY and P3 .3 connection (for modification) second, the available actions 1, press the D key to toggle the display P1.2 negated to year, month, day and hours, minutes and seconds 2, modify hours , minutes, seconds parameter unreasonable displays ERROR. , and return to the rebuilt modification 3, a key to m

倒计时时间修改（秒修改不完善）.txt

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