AS3525-A/-B C22O22
Data Sheet, Confidential
7.2.8.4 Functional description
Communication with the Memory Stick
The communication protocol with the Memory Stick is started by write from the CPU to the command register. When the protocol finishes, the CPU
is notified that the protocol has ended by an interrupt request.
Data transfer request
When the protocol is started and enters the data transfer state, data is requested by issuing a DMA transfer request or an interrupt request to the
CPU. Data can also be requested to an external memory.
Memory Stick communication time out
The RDY time out time when the handshake state (read protocol: BS2, write protocol: BS3) is established in communication with the Memory Stick
can be designated as the number of Memory Stick transfer clocks. When a time out occurs, the CPU is notified that the protocol has ended due to a
time out error by an interrupt request.
CRC off
CRC off can be set as a test mode.
When CRC off is set, CRC is not added to the data transmitted to the Memory Stick.
PAD cells
The connections to the MemoryStick Interface are shared with the General Purpose I/O port-D (GPIO xpd[0:7]).
Figure 15 external memory stick connection
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