单片机时钟 ds1302
2016-07-14 23:28:38 7 举报单片机时钟
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大纲/内容
end
N
Start
Waiting for release
Y
enter SET mod ++
clock exist
reach the alarm time
Scanning to key 1-4 is pressed
KEY 4
enter SET flag++
flag==4
Enter keyscan Program
flag=0
Scanning to key 5 is pressed
Bell
mod=0
mod==3
KEY 1
At the same time press key2&3
Ring more than 20 seconds
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