BU9458KV Application Note Rev. 0.02
PROPRIETARY AND CONFIDENTIAL
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14/42-
2009/05/28
V.1.2 State Transition Diagram
The following describes how the state transits from operation start.
Figure V.1.2 MODE 1 State Transition Diagram
1. When a memory device (USB memory or SD memory card) is inserted after the power ON sequence is completed, the
LSI starts recognizing the memory device automatically.
2. The LSI recognizes the memory device. When the currently selected memory device properly corresponds to the LSI,
it automatically searches files within the memory.
3. The LSI searches playable files within the memory device. When a playable file is searched and H is input to the
SEL_APLAY terminal port, the LSI stops. Or, STOP KEY interrupts the search operation and the LSI stops.
4. In the “stop” state, input of PLAY/PAUSE KEY enables the LSI to play the first sorted file within the memory device.
5. In the “play” state, input of PLAY/PAUSE KEY pauses the play operation.
6. In the “pause” state, input of PLAY/PAUSE KEY enables the LSI to play files.
7. In the “play” state, input of STOP KEY stops the LSI.
8. When the selected memory device is removed in the “stop” state, an error occurs.
9. In the “play” state, input of SELECT FILE TO PLAY KEY enables the LSI to search files in response to the given KEY
operation.
10. In the “pause” state, input of SELECT FILE TO PLAY KEY enables the LSI to search files in response to the given KEY
operation.
11. When files in the memory have been searched except during memory device recognition, the LSI automatically plays
searched files. During memory device recognition, the LSI automatically plays searched files only when L is input to
the SEL_APLY terminal port.
12. If another memory exists for the currently selected device in the “stop” state, input of CHNG_DEV KEY moves the
control to this memory.
13. If another memory exists for the currently selected device in the “play” state, input of CHNG_DEV KEY moves the
control to this memory.
14. If another memory exists for the currently selected device in the “pause” state, input of CHNG_DEV KEY moves the
control to this memory.
Power ON sequence
1
2
3
4
7
5
6
14
16
13
15
12
17
18
19
9
20
10
11
8
Recognize memory device
Memory search
S
top
Play
Pause
Error
Change device
