BU94501AMUV Datasheet, PDF (63/73 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU9450xAxxx series
Datasheet
19.2 Fixed interrupt mode
In fixed interruption mode, IRPTO is output by single status change according to system mode.
Following table shows IRPTO signal output condition for each system mode.
State
PLAYER MODE
FILE READ MODE
Interruption
MEMINFO = 0x3
FRDREADY
Contents
An interrupt occurs when status register MEMINFO=0x03
(OFFSET=0x37, [7:4] ).See 6.4.14. Selected memory information for
content.
Clear conditions; interruption is cleared by memory disconnection.
An interrupt occurs when a specified file is searched and read-out is
ready.
Clear conditions; interruption is cleared by data are read (block unit).
20. Previous Command Processing Situation
The previous command processing situation is outputted as status register STATUS6 (OFFSET=0x05) PRECOMSTAT.
Bit0 of STATUS6(OFFSET=0x05) and Bit2 of STATUS2 (OFFSET=0x01) is the same value. When Bit2 of STATUS2
set to "0", the previous command is normally processed. When Bit2 of STATUS2 set to "1", the previous command is
not processed.
The following shows the value descriptions.
Value
0x01
0x03
0x05
0x07
0x09
0x0B
0x0F
0x15
NAME
UNCLASSIFIED
UNKNOWN CMD
SEARCH
INVALID ARG
WRONG MODE
NOT READY
NOT IMPLEMENTED
DEVICE ERROR
Cause of being unprocessed
Non classification error
Undefined command
Searching now
Invalid parameter is detected.
Invalid command in the current system operation mode
Initialization is not completed.
The function is not mounted.
Device error
21. Selected memory information
The kind and information on a device which are chosen now are outputted by a READ_MEMINFO command.
An output value is cleared at the memory disconnection or CHG_DEV command reception, and is updated at the
completion of mount operation.
The details of an output value are shown below.
Value[7:4]
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
0x8-0xF
Contents
Mounted USB device (playable device)
NO-Mounted USB device (file system un-support, etc.)
USB LOW SPEED device
USB device with two or more DEVICE CONFIGRATION
The USB device and SD device which cannot be recognized
(USB enumeration failure etc.)
MEMINFO is undecided.
-
SD Card
It means that there is HUB, when Bit7 is H.
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