HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 1102

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 31
• RSPRD
31.3.8
CMDSTRT triggers the start of command 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
• Analyze/transfer receive data of prior command if necessary
• Preparation of transmission data of the next command if necessary
• Setting of CMDTYR, RSPTYR, TBCR, and TBNCR
• Setting of CMDR0 to CMDR4
The command sequences are controlled by the sequencers in each MMCIF side and MMC side.
Normally, these operate synchronously, however, these may become temporarily unsynchronized
when an error occurs or when a command is aborted. Take care to set the CMDOFF bit in OPCR,
to issue the CMD12 command, and to process an error in MMC mode. A new command sequence
should be started after confirming that the command sequences on both the MMCIF and MMC
sides have ended.
Rev. 3.00 Jan. 18, 2008 Page 1040 of 1458
REJ09B0033-0300
Bit
7 to 5
4 to 0
necessary
CMDR0 to CMDR4, CMDTYR, RSPTYR, TBCR, and TBNCR should not be changed until
command transmission has ended (the CWRE flag in CSTR has been set to 1).
Bit Name

RSPRD
Command Start Register (CMDSTRT)
MultiMediaCard Interface (MMCIF)
Initial
Value
All 0
All 0
R/W

R/W
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
These bits are cleared to H'00 by writing an arbitrary value.
Command response is stored.