Atmel SAM4S Series, Preliminary Data Sheet

Page: 880 / 1163

880
11100B–ATARM–31-Jul-12
SAM4S Series [Preliminary]
36.14.2 HSMCI Mode Register
Name: HSMCI_MR
Address: 0x40000004
Access: Read-write
This register can only be written if the WPEN bit is cleared in “HSMCI Write Protect Mode Register” on page 903 .
• CLKDIV: Clock Divider
High Speed MultiMedia Card Interface clock (MCCK or HSMCI_CK) is Master Clock (MCK) divided by (2*(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 (HSMCI_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
– – – – – – – –
23 22 21 20 19 18 17 16
– – – – – – – –
15 14 13 12 11 10 9 8
PDCMODE PADV FBYTE WRPROOF RDPROOF PWSDIV
7 6 5 4 3 2 1 0
CLKDIV