数字手表状态图：时间显示和设定模式

Start
|
V
Display time mode
|
V
Press 'A' button
|
V
Display hour mode
|
V
Press 'A' button
|
V
Set hour mode
|
V
Press 'B' button
|
V
Increase hour
|
V
Press and hold 'B' button for 5 seconds
|
V
Rapidly increase hour every 0.5 seconds
|
V
Release 'B' button
|
V
Set hour mode
|
V
Press 'A' button
|
V
Set minute mode
|
V
Press 'B' button
|
V
Increase minute
|
V
Press and hold 'B' button for 5 seconds
|
V
Rapidly increase minute every 0.5 seconds
|
V
Release 'B' button
|
V
Set minute mode
|
V
Press 'A' button
|
V
Display minute mode
|
V
Press 'A' button
|
V
Display time mode
|
V
End