BU94501AMUV Datasheet, PDF (35/73 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU9450xAxxx series
Datasheet
13. Command operations
13.1 Write command
The LSI allows command operations from an external microcomputer via a slave I²C serial interface.
The command length to be sent varies depending on the command.
Table 9. shows the command specifications.
Table 10. shows enabled/disabled state of each command.
Table 9. Command Operations
Command name
Comma Command
nd
Byte 1st 2nd 3rd
length
CONFIG
CHG_SYSTEM_MOD 4 0x60 0x00 N
E
4th
0x00
STOP
2 0x60 0x01 -
-
ABORT
4 0x60 0x02 0x01 0x00
Explanation of operation
・Set up System Operation Mode.
・Please choose 3rd byte N from the following. The other setup does not receive
a command. Please be sure to perform the changes to each mode via CONFIG
mode. The changes between PLAYER mode and FILEREAD mode cannot be
performed directly
N= 0x00 ; CONFIG Mode
N= 0x01 ; PLAYER Mode
N= 0x02 ; FILE RW Mode
The initial setting is N= 0x00.
・When receiving the STOP command, end the present processing and shift to
the initial state in each system operation mode.
・Playing of a file will be stopped when receiving the STOP command during
Playing, a stop, and file search.
・Playing of a file will be stopped when receiving the STOP command during fast
forward or fast back Playing.
・After stopping playing the file, the LSI restarts playing it from the tune being
stopped. However, if the memory is removed and new one is inserted before
restarting, the LSI returns to the top tune of the memory.
・Suspends folder analysis. After suspend, the analysis state becomes "not
analyzed" and the cursor position becomes invalid. In order to reset this status,
it is necessary to transmit an ANALYZE_ROOT command, and it is necessary
to make the cursor position valid. After ANALYZE_ROOT command, contents
acquisition of a desired folder can be performed. It is not necessary to analyze
intermediate folders one by one from a route folder.
・The LSI suspends analysis only and continues playing the file when receiving
the ABORT command.
CHG_DEV
2 0x60 0x03 -
- ・This command select device between USB memory and SD memory card.
To do this, both devices must be connected or one device is provided against
the other (USB memory against SD memory card, and vice versa). Any other
cases will be ignored.
・After the device is selected, the system operation mode remains the previous
mode (before selecting) and goes to the initial state.
・The setting values of the individual commands remain as they are. However,
those of the REPEAT and RANDOM commands return to the initial values.
DIS_WDT
SET_WDT
SET_SORT
2 0x60 0x04 -
2 0x60 0x05 -
- ・This command disables Watch dog Timer.
・Initial setting is that Watch dog Timer function is effective.
- ・This command writes “1” to STATUS WDT_RFLG when it is executed.
4 0x60 0x06 N 0x00 ・Set up file sorting operation in a memory.
・Select N at the 3^rd byte from the following. Any setting other than N=0x00 is
considered to specify N=0x01.
N=0x00: Disables sorting of files/folders.
Data is read out in the order that is written to FAT.
N=0x01: Enables sorting of files/folders.
・Initial setting is N= 0x01. A sorting function is effective.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
35/69
TSZ02201-0V2V0E600070-1-2
2012.12.10 Rev.003