Sd Protocol; Figure 213. "No Response" And "No Data" Operations; Figure 214. "Multiple" Block Read Operation; Figure 215. "Multiple" Block Write Operation - Holtek HT32F12345 User Manual

32-Bit Arm ® Cortex ® -M3 MCU
HT32F12345

SD Protocol

SD communication over the SD bus is based on command, response and data bit streams that are
initiated by a start bit and terminated by a stop bit. On the CMD line the MSB bit is transmitted
first.
from
host to
card(s)
CMD
DAT

Figure 213. "No Response" and "No Data" Operations

from
host to
card
CMD command
DAT

Figure 214. "Multiple" Block Read Operation

from
host to
card
CMD command
DAT

Figure 215. "Multiple" Block Write Operation

Rev. 1.10
from
host to
card
command
operation (no response)
from
card to
host
response
data block crc data block crc
block read operation
multiple block read operation
from data from
card to
host
response
data block crc
block write operation
multiple block write operation
567 of 590
from
card to
host
command response
operation (no data)
data from
stop command
card to
stops data transfer
host
command
data block crc
data stop operation
crc ok
response
stop command
and busy
card to
stops data transfer
from card
host
to host
command
busy data block crc
data stop operation
response
response
busy
November 28, 2018