Operation Of Relative Address Commands; Operation Of Commands Not Requiring Command Response - Renesas H8S/2158 User Manual

19.5.2

Operation of Relative Address Commands

The CMD7M, CMD9, CMD10, CMD13, CMD15M, CMD39M, and CMD55 are relative address
commands that address the MMC by the RCA. The relative address commands are used to read
MMC administration information and original information, and to change the specific MMC
status. Operation of a typical command is summarized below.
• CMD7M sets one addressed MMC to the transfer state, and other MMCs to the standby state.
Commands requiring data transmission/reception can be executed for the MMC in the transfer
state.
• CMD15M sets the addressed MMC to the inactive state.
• CMD55 sets the addressed MMC to the application original extension command acceptance
state.
19.5.3

Operation of Commands Not Requiring Command Response

In MMC mode, commands do not require command responses.
Figure 19.2 shows an example of the command sequence for commands that do not require
command responses. Figure 19.3 shows the operational flow for commands that do not require
command responses.
• The settings needed to issue a command are made.
• The START bit in CMDSTRT is set to 1 to start command transmission.
• The end of a command sequence is detected by poling the BUSY flag in CSTR or by the
command transmission end interrupt (CMDI).
Section 19 Multimedia Card Interface (MCIF)
Rev. 3.00 Jan 25, 2006 page 657 of 872
REJ09B0286-0300