It is a typical example to make a digital clock with the MCU. This design makes a good use of the I/O redirections,And we use two pieces of 74ls07 as the drivers for the LED, two pieces of 74ls138 as the encoders. We desplay the time in dynamic mathod. For the purpose of improving the ability of driving ,we add the 9013 as the driver for the LED.
The work we design use 24 hour format, we add a alarm, so the clock can remind us at the time we set ahead. Moreover for the sake of demand, we still add the stop-watch function.
Key words:the Minimum system drive dynamic display encoder