Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
794
35.14.2 HSMCI Mode Register
Name: HSMCI_MR
Address: 0xFFF80004 (0), 0xFFFD0004 (1)
Access: Read/Write
This register can only be written if the WPEN bit is cleared in “HSMCI Write Protect Mode Register” on page 818.
• CLKDIV: Clock Divider
High Speed MultiMedia Card Interface clock (MCCK or HSMCI_CK) is Master Clock (MCK) divided by (2*(CLKDIV+1)).
• PWSDIV: Power Saving Divider
High Speed MultiMedia Card Interface clock is divided by 2
(PWSDIV)
+ 1 when entering Power Saving Mode.
Warning:
This value must be different from 0 before enabling the Power Save Mode in the HSMCI_CR (PWSEN bit).
• RDPROOF Read Proof Enable
Enabling Read Proof allows to stop the HSMCI Clock during read access if the internal FIFO is full. This will guarantee data
integrity, not bandwidth.
0: Disables Read Proof.
1: Enables Read Proof.
• WRPROOF Write Proof Enable
Enabling Write Proof allows to stop the HSMCI Clock during write access if the internal FIFO is full. This will guarantee
data integrity, not bandwidth.
0: Disables Write Proof.
1: Enables Write Proof.
• FBYTE: Force Byte Transfer
Enabling Force Byte Transfer allow byte transfers, so that transfer of blocks with a size different from modulo 4 can be
supported.
Warning:
BLKLEN value depends on FBYTE.
0: Disables Force Byte Transfer.
1: Enables Force Byte Transfer.
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
– PADV FBYTE WRPROOF RDPROOF PWSDIV
76543210
CLKDIV