BU94501AMUV Datasheet, PDF (59/73 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU9450xAxxx series
15. Resume information
This LSI outputs the information for resume function, using READ_RESUME_INFO command.
Datasheet
Table 14. Resume information register structure
Status
OFFSET
0x38-0x61
The
number of
bytes
NAME
42
Resume information
data
Contents
This data shows the information on the file being played and on
the play position.
The data has a LSI-unique structure.
The resume information data is data of 42 bytes.
It outputs with a little endian.
The above resume information has a LSI-unique structure and is used when executing resume play. Therefore, you
should use the data contents as they are without rewriting.
The resume function is implemented by writing the resume information read by READ_RESUME_INFO command to
PLAY_RESUME command. After writing to PLAY_RESUME, the LSI automatically searches the resume. As for the
action of the searches end, selectable from [Playback is started in the time when 「READ_RESUME_INFO」command
was forwarded], [top (Pause) in the time when 「READ_RESUME_INFO」command was forwarded], [Playback is
started from the front of the tune when 「READ_RESUME_INFO」command was forwarded], [Stop (Pause) the front
of the tune when 「READ_RESUME_INFO」command was forwarded].
After reading READ_RESUME_INFO command during file play, the LSI resumes the file from the time
READ_RESUME_INFO has been read.
The data contents read by READ_RESUME_INFO command cannot assure the operations when executing
PLAY_RESUME which has been rewritten due to the positional information within the memory. If the resume
information does not match because of change of memory, the LSI starts searches front file of memory.
16. File Name, Folder Name, TAG Information
A file name, a folder name, and TAG information are outputted to a status register.
The first 2 bytes to be output indicate file data ID information.
The target data is outputted from the 3rd byte.
A file name, a folder name, and TAG information status register structure are shown in Table 15.
Table 15.File (folder, TAG) information registers structure
Status
OFFSET
The
number of
bytes
NAME
Contents
0x38
1
Data type
The type of data is outputted.
0x00; TEXT- NUL (0x00) Terminated character string
0x01; BYTE- Unsigned 1 byte integer
0x39
1
Encoding
Encoding of a character string is outputted.
0x00 ; ISO8859-1(Latin1)
0x01 : UTF-16(with BOM)
0x02 : UTF-16BE
0x03 : UTF-8
0x49 : UTF-16LE
When a data type is except 0x00:TEXT, data length (byte unit) is
outputted.
0x3A-0xB9
128
File name
(Folder name, TAG)
A file name (or a folder name, TAG) is outputted by left fitting.
Up to 128 bytes can be output.
If the data is less than 128 bytes, it terminates with 0x00.
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