at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 761

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

39.9.7
Name:
Access Type:
• 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 unpredict-
able 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:
6249D–ATARM–20-Dec-07
0
1
1
Other values
31
23
15
TRTYP
7
In SDIO Byte mode, BLKLEN field is not used.
0
0
0
MCI Block Register
1
0
1
Type of Transfer
MMC/SDCard Multiple Block
SDIO Byte
SDIO Block
-
30
22
14
MCI_BLKR
Read/write
6
29
21
13
5
BCNT Authorized Values
From 1 to 65536: Value 0 corresponds to an infinite block transfer.
From 1 to 512 bytes: value 0 corresponds to a 512-byte transfer.
Values from 0x200 to 0xFFFF are forbidden.
From 1 to 511 blocks: value 0 corresponds to an infinite block transfer.
Values from 0x200 to 0xFFFF are forbidden.
Reserved.
28
20
12
4
BLKLEN
BLKLEN
BCNT
BCNT
27
19
11
3
AT91SAM9263 Preliminary
26
18
10
2
25
17
9
1
24
16
8
0
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