SH7763 Datasheet, PDF (1396/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 31 Multimedia Card Interface (MMCIF)
• If the card returns no command response, the command response is detected through the
command timeout error (CTERI).
• The end of the command sequence is detected by poling the BUSY flag in CSTR or through
the command response receive end interrupt (CRPI).
• Check whether the state is data busy or not through the DTBUSY_TU bit in CSTR. If data
busy is detected, the end of data busy state is detected through the data busy end interrupt
(DBSYI).
• Write the CMDOFF bit to 1 when a CRC error (CRCERI) or command timeout error (CTERI)
occurs.
Input/output pins
CLK
CMD
DAT
CMDSTRT
(START)
INTSTR0
(CMDI)
(CRPI)
(DBSYI)
CSTR
(CWRE)
(BUSY)
(DTBUSY_TU)
Command output (48 bits)
Command transmission
started
Command response
reception
(No busy state)
Response reception
completed
Command transmission period
Command sequence execution period
(DTBUSY)
(REQ)
Figure 31.4 Example of Command Sequence for Commands without Data Transfer
(No Data Busy State)
Rev. 1.00 Oct. 01, 2007 Page 1330 of 1956
REJ09B0256-0100