SH7763 Datasheet, PDF (1368/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 31 Multimedia Card Interface (MMCIF)
31.3.7 Command Start Register (CMDSTRT)
CMDSTRT is an 8-bit readable/writable register that triggers the start of command transmission or
Stop Tran transmission, representing the start of a command sequence. The following operations
should be completed before the command sequence starts.
Command transmission:
• Analysis of prior command response, clearing the command response register write if
necessary
• Analysis/transfer of receive data of prior command if necessary
• Preparation of transmit data of the next command if necessary
• Setting of CMDTYR, RSPTYR, TBCR, and TBNCR
The CMDR0 to CMDR4, CMDTYR, RSPTYR, TBCR, and TBNCR registers should not be
changed until command transmission has ended (during the time the CWRE flag in CSTR is
set to 1).
• Setting of CMDR0 to CMDR4
Stop Tran transmission:
• Setting of CMDTYR and RSPTYR
The CMDTYR and RSPTYR registers should not be changed until command transmission has
ended (during the time the CWRE flag in CSTR is set to 1).
Rev. 1.00 Oct. 01, 2007 Page 1302 of 1956
REJ09B0256-0100