Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
772
Figure 35-7. Command/Response Functional Flow Diagram
Notes: 1. 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
Ye s
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