BU94501AMUV Datasheet, PDF (29/73 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU9450xAxxx series
Datasheet
10. Interrupt Signals to microprocessor
10.1 BUSY
BUSY status detection output
Signal name I/O
Function
BUSY
O BUSY status detection output signal
Remarks
H: Busy, L: Not Busy
This is output to indicate that the LSI is in the BUSY status.
A BUSY signal outputs H until analyzing a command from the master and starting the command operation.
The command input to this LSI in BUSY status is unacceptable.
Connect it to the PIO port of the microcomputer.
10.2 MCHNG
Tune number change detection output
Signal name I/O
Function
Remarks
MCHNG O Tune number change detection output signal H: During playing, L: At the end or stop of tune
This signal outputs the information which tells that the file within the memory is being played or the file to be
played is changed.
Precisely, the signal outputs H during the internal decode sequence operation, and L at stop of the operation.
Connect it to the interruption port of the microcomputer.
10.3 SEARCH
SEARCH status detection output
Signal name I/O
Function
Remarks
SEARCH O SEARCH status detection output signal H: SEARCH, L: Not SEARCH
This is output to indicate that the LSI is in the SEARCH status.
A SEARCH signal becomes H at the time of memory mount, file search, TAG analysis and TOC analysis.
This signal is OR of the 2-bit SEARCH status.
The LSI ignores command input during SEARCH. However, it can accept only ABORT, STOP and status read
commands even during SEARCH and can execute them command.
Connect it to the PIO port of the microcomputer.
10.4 IRPTO
Interrupt output to microcomputer
Signal name I/O
Function
IRPTO
O Interrupt output to microcomputer
Remarks
H: Interrupt, L: Not Interrupt
This is output to indicate that the LSI is now requiring interruption to the microcomputer.
Change from L to H shows that an interruption has occurred.
When signage is H, it is shown that interrupt occurs.
Connect it to the interruption port of the microcomputer.
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2012.12.10 Rev.003