Datasheet

 2017 Microchip Technology Inc. DS60001516A-page 589
SAM9G20
34.9.7 MCI Block Register
Name: MCI_BLKR
Access: Read/Write
BCNT: MMC/SDIO Block Count - SDIO Byte Count
This field determines the number of data byte(s) or block(s) to transfer.
The transfer data type and the authorized values for BCNT field are determined by the TRTYP field in the MCI Command Register
(MCI_CMDR):
Warning:
In SDIO Byte and Block modes, writing to the 7 last bits of BCNT field, is forbidden and may lead to unpredictable results.
BLKLEN: Data Block Length
This field determines the size of the data block.
This field is also accessible in the MCI Mode Register (MCI_MR).
Bits 16 and 17 must be set to 0 if PDCFBYTE is disabled.
Note: In SDIO Byte mode, BLKLEN field is not used.
31 30 29 28 27 26 25 24
BLKLEN
23 22 21 20 19 18 17 16
BLKLEN
15 14 13 12 11 10 9 8
BCNT
76543210
BCNT
TRTYP Type of Transfer BCNT Authorized Values
0 0 1 MMC/SDCard Multiple Block From 1 to 65535: Value 0 corresponds to an infinite block transfer.
1 0 0 SDIO Byte
From 1 to 512 bytes: value 0 corresponds to a 512-byte transfer.
Values from 0x200 to 0xFFFF are forbidden.
101SDIO Block
From 1 to 511 blocks: value 0 corresponds to an infinite block transfer.
Values from 0x200 to 0xFFFF are forbidden.
Other values – Reserved.