Datasheet

SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
558
Figure 34-9. Write Functional Flow Diagram
Note: It is assumed that this command has been correctly sent (see Figure 34-7).
Send SELECT/DESELECT_CARD
command
(1)
to select the card
Send SET_BLOCKLEN command
(1)
Write using PDC
Reset the PDCMODE bit
MCI_MR &= ~PDCMODE
Set the block length
MCI_MR |= (BlockLenght <<16)
Send WRITE_SINGLE_BLOCK
command
(1)
Set the PDCMODE bit
MCI_MR |= PDCMODE
Set the block length
MCI_MR |= (BlockLength << 16)
Configure the PDC channel
MCI_TPR = Data Buffer Address to write
MCI_TCR = BlockLength/4
Send WRITE_SINGLE_BLOCK
command
(1)
Read status register MCI_SR
Poll the bit
NOTBUSY= 0?
Yes
RETURN
No
Yes
No
Read status register MCI_SR
Number of words to write = 0 ?
Poll the bit
TXRDY = 0?
MCI_TDR = Data to write
Number of words to write =
Number of words to write -1
Yes
RETURN
No
Yes
No
Number of words to write = BlockLength/4
MCI_PTCR = TXTEN