BU94601KV_12 Datasheet, PDF (28/70 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU94601KV BU94603KV BU94604BKV
Datasheet
20.5 Search within multi-drive and multi-partition
If a device is a multi-drive type or multi partition type, the LSI can recognize the drive by selecting LUN (Logical
Unit Number) for the supporting FAT. (MODE2 and MODE3)
If particular LUN isn’t selected, the LSI mounts the device whose LUN detected first. (default)
When the multi-card reader is connected, the LSI can recognize device which connected to the card-reader by
selecting LUN. But after the device is mounted, it’s impossible to recognize states whether the device connected to
the card-reader is inserted or removed.
20.6 External HUB search
When the USB connector is connected to a HUB, and a FAT-supported drive is connected ahead of the HUB at
mounting the USB for this LSI, only one drive is recognized.
The LSI does not support external HUBs, it cannot detect plugging/unplugging of the drive ahead of the HUB after
the USB is mounted.
21. MODE1
21.1 KEY command operation
21.1.1 KEY SCAN (Single Mode)
KEY SCAN operates in the following sequence on the circuit configuration as shown in Figure 9.
(1) KEY_COL1 to 3 output waveforms at timing as shown in Figure25.
(2) By pressing KEY switch, KEY_ROW 1 to 4 are set to L at timing when KEY_COL 1 to 3 are L.
(3) When detecting L input from KEY_ROW 1 to 4 three times, the master judges that KEY has been
pressed. Then, the master starts the KEY operation.
Figure 25 KEY SCAN Waveform.
420ns
420ns
KEY_COL1
KEY_COL2
KEY_COL3
420ns
20ms
PLAY
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
KEY_COL1
Figure 26 Operating Waveforms when KEY is Pressed
20ms
20ms 20ms
20ms
20ms
20ms
Determine that KEY is pressed
Start the operation of the pressed KEY.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
28/66
TSZ02201-0V2V0E600010-1-2
2012.07.12 Rev.001