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型號(hào)：	MQ83C154XXX-12P883
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44
封裝：	CERAMIC, QFP-44
文件頁(yè)數(shù)：	552/832頁(yè)
文件大?。?/td>	12467K
代理商：	MQ83C154XXX-12P883

6384E–ATARM–05-Feb-10

AT91SAM9G20

The two bus modes (open drain and push/pull) needed to process all the operations are defined

in the MCI command register. The MCI_CMDR allows a command to be carried out.

For example, to perform an ALL_SEND_CID command:

The command ALL_SEND_CID and the fields and values for the MCI_CMDR Control Register

bcr means broadcast command with response.

The MCI_ARGR contains the argument field of the command.

To send a command, the user must perform the following steps:

Fill the argument register (MCI_ARGR) with the command argument.

Set the command register (MCI_CMDR) (see Table 35-6).

The command is sent immediately after writing the command register. The status bit CMDRDY

in the status register (MCI_SR) is asserted when the command is completed. If the command

requires a response, it can be read in the MCI response register (MCI_RSPR). The response

size can be from 48 bits up to 136 bits depending on the command. The MCI embeds an error

detection to prevent any corrupted data during the transfer.

The following flowchart shows how to send a command to the card and read the response if

needed. In this example, the status register bits are polled but setting the appropriate bits in the

interrupt enable register (MCI_IER) allows using an interrupt method.

Table 35-4.

Host Command

Table 35-5.

ALL_SEND_CID Command Description

CMD Index

Argument

Abbreviation

Description

[31:0] stuff bits

ALL_SEND_CID

Asks all cards to send

their CID numbers on

the CMD line

Table 35-6.

Fields and Values for MCI_CMDR Command Register

CMDNB (command number)

RSPTYP (response type)

2 (R2: 136 bits response)

SPCMD (special command)

0 (not a special command)

OPCMD (open drain command)

MAXLAT (max latency for command to response)

0 (NID cycles ==> 5 cycles)

TRCMD (transfer command)

0 (No transfer)

TRDIR (transfer direction)

X (available only in transfer command)

TRTYP (transfer type)

X (available only in transfer command)

IOSPCMD (SDIO special command)

0 (not a special command)

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