Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

 835

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

Name: HSMCI_BLKR

0x40000018

Access: Read-write 

 

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 HSMCI Command Reg-
ister (HSMCI_CMDR).

When TRTYP=1 (MMC/SDCARD Multiple Block), BCNT can be programmed from 1 to 65535, 0 corresponds to an infinite block 
transfer. 

When TRTYP=4 (SDIO Byte), BCNT can be programmed from 1 to 511, 0 corresponds to 512-byte transfer. Values in range 512 
to 65536 are forbidden.

When TRTYP=5 (SDIO Block), BCNT can be programmed from 1 to 511, 0 corresponds to an infinite block transfer. Values in 
range 512 to 65536 are forbidden.

Warning: In SDIO Byte and Block modes (TRTYP=4 or 5), writing the 7 last bits of BCNT field with a value which differs from 0 is 
forbidden and may lead to unpredictable results.

This field determines the size of the data block. 

This field is also accessible in the HSMCI Mode Register (HSMCI_MR).

Bits 16 and 17 must be set to 0 if FBYTE 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

7

6

5

4

3

2

1

0

BCNT