Datasheet

SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
1110
Figure 41-7. Command/Response Functional Flow Diagram
Note: If the command is SEND_OP_COND, the CRC error flag is always present (refer to R3 response in the High Speed
MultiMedia Card specification).
RETURN OK
RETURN ERROR
(1)
RETURN OK
Set the command argument
HSMCI_ARGR = Argument
(1)
Set the command
HSMCI_CMDR = Command
Read HSMCI_SR
CMDRDY
Status error flags?
Read response if required
Yes
Wait for command
ready status flag
Check error bits in the
status register
(1)
0
1
Does the command involve
a busy indication?
No
Read HSMCI_SR
0
NOTBUSY
1