SH7721 datasheet(1122/1524 Pages) RENESAS

Part #	SH7721

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

PDF	1524 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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1122 / 1524 page

Section 31

MultiMediaCard Interface (MMCIF)

Rev. 3.00 Jan. 18, 2008 Page 1060 of 1458

REJ09B0033-0300

(3)

Operation of Commands that do not Require Command Response

Some broadcast commands do not require command response.

Figure 31.2 shows an example of the command sequence for commands that do not require

command response.

Figure 31.3 shows the operational flow for commands that do not require command response.

• 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 command sequence is detected by poling the BUSY flag in CSTR or by the

command output end interrupt (CMDI).

CLK

CMD

DAT

CMDSTRT

(START)

INTSTR0

(CMDI)

CSTR

(CWRE)

(BUSY)

(REQ)

Input/output pins

Command output (48 bits)

Command transmission

started

Command transmission

ended

Command transmission period

Command sequence period

Figure 31.2

Example of Command Sequence for Commands

that do not Require Command Response

SH7721 Datasheet(PDF) 1122 Page - Renesas Technology Corp