Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD データシート

 818

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

Note:

1. It is assumed that this command has been correctly sent (see 

Read status register HSMCI_SR

Send SELECT/DESELECT_CARD

command

(1)

to select the card

Send SET_BLOCKLEN command

(1)

Read with PDC

Reset the PDCMODE bit
HSMCI_MR

= PDCMODE

Set the block length (in bytes)
HSMCI_MR = (BlockLenght

16)

Number of words to read = 0

Poll the bit

RXRDY = 0

Read data = HSMCI_RDR

Number of words to read =

Number of words to read -1

Send READ_SINGLE_BLOCK

command

(1)

Yes

Set the PDCMODE bit
HSMCI_MR = PDCMODE
Set the block length (in bytes)
HSMCI_MR = (BlockLength

16)

Configure the PDC channel
HSMCI_RPR = Data Buffer Address
HSMCI_RCR = BlockLength/4
HSMCI_PTCR = RXTEN

Send READ_SINGLE_BLOCK

command

(1)

Read status register HSMCI_SR

Poll the bit

ENDRX = 0

Yes

RETURN

RETURN

Yes

No

No

No

Yes

No

Number of words to read = BlockLength/4