SH7721 datasheet(1108/1524 Pages) RENESAS

1108 / 1524 page

Section 31

MultiMediaCard Interface (MMCIF)

Rev. 3.00 Jan. 18, 2008 Page 1046 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial

Value

R/W

Description

DTBUSY

Data Busy

Indicates command execution status. Indicates that the

MMC is in the busy state during or after the command

sequence of a command without data transfer, which

includes the busy state in the response, or of a command

with write data has been ended.

0: Idle state waiting for a command, or command sequence

execution in progress.

1: MMC indicates data busy after command sequence ends.

DTBUSY_

Undefined

Data Busy Pin State

Monitors level of the DAT pin and DO pin.

This bit is monitored to confirm whether the card is in busy

state by deselecting the card in busy state, and then

selecting the card, again.

0: Indicates that the card is in busy state.

1: Idle state waiting for command.

—

Reserved

This bit is always read as 0. The write value should always

be 0.

REQ

Interrupt Request

Indicates whether an interrupt is requested. An interrupt

request is the logical sum of the INTSTR0, INTSTR1, and

INTSTR2 flags. The INTSTR0, INTSTR1, and INTSTR2

flags are set by the enable bits in INTCR0, INTCR1, and

INTCR2.

0: No interrupts requested

1: An interrupt is requested

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