功能完整的1602LCD时钟实验

按K1按键进入设定状态

按K2,依次进入闹钟功能是否启用，闹钟时,分秒,年,月,日及时间时,分,秒的设置,直到退出设置状态

按K3,调整是否起用闹钟和调节闹钟时,分,秒,年,月,日,时间的时,分,秒的数字

LCD第二排中间显示小喇叭，表示启用闹钟功能，无则禁止闹钟功能（可在调整状态进行设置）

正常状态,LCD上排最前面显示自定义字符,LCD下排最前面闪动 RICHMCU

设置状态,LCD上排最前面显示 P ,下排最前面在设置闹钟时间时显示 alarm: ,其它状态显示 time

年代变化2000 2099,星期自动转换-Press the button to enter the setting mode, press K1 K2, in order to enter the alarm function is enabled, when the alarm clock, every minute, year, month, day and time, minutes and seconds of setting until you exit the setting mode, press K3, alarm clock and adjust if hired When adjusting the alarm, minutes, seconds, year, month, day, time, minutes and seconds of the second row in the middle digit LCD display small speaker, said that the alarm function is enabled, no alarm function is prohibited (can be set in the adjustment of status) normal state, LCD display on the front row of a custom character, LCD at the front row of flashing " RICHMCU"　setting status, LCD display on the front row " P" , displayed at the front row when setting the alarm time " alarm:"　Other status display " time"　era of change 2000 2099, automatic conversion week