SH7720 Datasheet, PDF (1127/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Command sequence start
Write command to CMDR0 to CMDR4
Write command type to CMDTYR
Write response type to RSPTYR
Write 1 to CMDSTRT
Section 31 MultiMediaCard Interface (MMCIF)
CRCERI interrupt
Yes
generated?*
No
CRPI interrupt
No
generated?
Yes
No
R1b response?
Yes
No
DTBUSY detected?
Yes
CTERI interrupt
No
generated?
Yes
Write 1 to CMDOFF
No
DBSYI interrupt
generated?
Yes
Command sequence end
Note*:
For the R2 command response, no CRC check is performed by hardware.
Therefore, perform CRC checking by software to see if there is an error.
Figure 31.6 Operational Flowchart for Commands without Data Transfer
Rev. 3.00 Jan. 18, 2008 Page 1065 of 1458
REJ09B0033-0300