BU94501AMUV Datasheet, PDF (46/73 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU9450xAxxx series
Datasheet
FILE READ
FOPEN_R
FOPEN_R_CURSOR
260 0x63 0x01 0x00 0x00 ・This command specifies the full path and name of the file to be read from the
memory using the File Read function.
・If a file exists after receiving the command, open the specified file.
・The full path is 256 bytes at maximum (including drive letter (A:\), file name and
extension). Set this at the 5^th-260^th bytes.
If the length is less than 256 bytes, insert 0x00 at the end. Insert ”\”(0x5C) for
the delimiter between folder layers.
・The drive letter is "A:\" for USB and "B:\" for SD.
・You can also specify the path in a format without drive letter. In this case, the
length is 253 bytes at maximum.
・If the full path has a drive letter different from the one for the memory being
selected, an error occurs. (For example, "B:\" is set for the full path when
USB is selected.)
4 0x63 0x01 0x01 0x00 ・This command specifies the file pointed by the memory browsing cursor for the
one to be read from the memory using the File Read function.
・If a file exists after receiving the command, open the specified file.
FOPEN_R_DIRECT
FCLOSE
10 0x63 0x01 0x02 0x00 ・This command specifies the access data of the file to be read from the memory
using the File Read function.
・The access data is 6 bytes. Set it at the 5^th-10^th bytes.
・If a file exists after receiving the command, open the specified file.
4 0x63 0x03 0x00 0x00 ・This command closes the file.
・After the File Read function is completed, CLOSE the file.
FREAD_DAT
6 0x63 0x06 N N ・This command specifies the position of data to be read from the file at File
Read.
・Specify the data position to be read in the 3^rd to 6^th bytes in Little Endian
format.
・When using the I²C bus, send this command and then check that the
FRDREADY bit turns 1. Then, send the READ_FR_DATA command. Data
of up to 256 bytes can be read at one time.
・When using the SPI bus, send this command and then check that the
FRDREADYA bit turns 1. Then, read the data from the SPI bus. Data of up
to 4096 bytes can be read at one time.
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TSZ02201-0V2V0E600070-1-2
2012.12.10 Rev.003