BU94601KV_12 Datasheet, PDF (50/70 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU94601KV BU94603KV BU94604BKV
Datasheet
23. MODE3
MODE3 specifies and plays the file to be played by the master microcomputer by outputting the file/folder status
information, written to USB memory or SD memory card, to the master microcomputer.
23.1 Command operation
The LSI sends commands to obtain the file/folder information in USB memory or SD memory card, to analyze
ID3Tag, to analyze WMATag, to analyze AACTag, and to set a file to be played and start playing it.
Table 19. shows the commands available in MODE3. When sending a command other than listed below in
MODE3, it is ignored.
Table 19. MODE3 Command
Command
Command name byte
length ^1st
Command
2nd
3rd-
PAUSE
0x02
-
STOP
0x03
-
Operation description
· When receiving “PAUSE” command during play, the master
stops playing file temporarily.
· This command stops the operations of Tag analysis.
· This command stops playing file and stop at top of this file.
VOL+
VOL-
0x04
-
0x05
-
CHNG_DEV
0x08
-
2 0x50
GET_DIRECT
0x09
-
GET_NUMBER
0x0A
-
GET_ID3
0x0B
-
· When SEL_VOL is set to H, “VOL+” command is enabled.
· When receiving “VOL+” command, the master controls
sound volume.
· Sound volume can be controlled at 32 steps from -∞
(minimum volume) to 0dB (maximum volume).
· When SEL_VOL is set to H, “VOL-“command is enabled.
· When receiving “VOL-“command, the master controls
sound volume.
· Sound volume can be controlled at 32 steps from -∞
(minimum volume) to 0dB (maximum volume).
· The command selects the device between USB memory
and SD memory card. To do this, both devices should be
connected or one device should correspond to the other
(USB to SD or SD to USB). Otherwise, this command is
ignored.
· After selecting the device, the LSI waits for a command.
· This command obtains the folder information (*see 23.3)
and file information (*see 23.3) for the folder set by
SET_DIRECT.
· Read the information using the status commands
“READ_FOLDER_INFO” and “READ_FILE_INFO”.
· The status of “ANA_END”, “FOLINF”, “FILINF”, “FOLFULL”
and “FILFULL” are reset.
· This command obtains the number of files and folders for
the folder set by SET_DIRECT.
· Read the information using status command
“READ_NUMBER”.
· The number of unsupported files is ignored.
· The statuses of “ANA_END” are reset.
· This command performs TAG analysis for the valid file set
by SET_DIRECT.
· The command also analyzes even if the folder is not
specified. However, at the end of analysis, a status in
which Tag information is not contained will be output.
- The statuses of “ID3EXIST”, “ID3RSID1” and “ID3RSID2”
are reset.
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2012.07.12 Rev.001