Datasheet

SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
556
Figure 34-8. Read Functional Flow Diagram
Note: It is assumed that this command has been correctly sent (see Figure 34-7).
Read status register MCI_SR
Send SELECT/DESELECT_CARD
command
(1)
to select the card
Send SET_BLOCKLEN command
(1)
Read with PDC
Reset the PDCMODE bit
MCI_MR &= ~PDCMODE
Set the block length (in bytes)
MCI_MR |= (BlockLenght <<16)
Number of words to read = 0 ?
Poll the bit
RXRDY = 0?
Read data = MCI_RDR
Number of words to read =
Number of words to read -1
Send READ_SINGLE_BLOCK
command
(1)
Yes
Set the PDCMODE bit
MCI_MR |= PDCMODE
Set the block length (in bytes)
MCI_MR |= (BlockLength << 16)
Configure the PDC channel
MCI_RPR = Data Buffer Address
MCI_RCR = BlockLength/4
MCI_PTCR = RXTEN
Send READ_SINGLE_BLOCK
command
(1)
Read status register MCI_SR
Poll the bit
ENDRX = 0?
Yes
RETURN
RETURN
YesNo
No
No
Yes
No
Number of words to read = BlockLength/4