W90P710_05 Datasheet, PDF (245/526 Pages) Winbond – 16/32-bit ARM microcontroller

W90P710
SD Interface Control Register (SDCR)
REGISTER ADDRESS R/W
DESCRIPTION
SDICR 0xFFF0_7300 R/W ^{SD Interface Control Register}
RESET VALUE
0x0000_0000
31
23
15
SD_CS
7
CLK_KEEP
30
22
14
Reserved
6
8CLK_OE
29
21
13
5
74CLK_OE
28
27
26
Reserved
20
19
18
Reserved
12
11
10
CMD_CODE
4
3
2
R2_EN DO_EN DI_EN
25
17
9
1
RI_EN
24
16
8
0
CO_EN
BITS
[31:16] Reserved
[15]
SD_CS
[13:8] CMD_CODE
[7]
CLK_KEEP
[6]
8CLK_OE
DESCRIPTIONS
-
SD Card Select Control
0=Select SD card-0
1=Select SD card-1
It is fixed to 0 at W99P710
SD Command Code
This register contains the SD command code (00H – 3FH).
SD Clock Enable
0=Disable SD clock generation
1=SD clock always keeps free running.
8 Clock Cycles Output Enable
0=Disable
1=Enable, SDIO host controller output 8 clock cycles
When the operation is finished, this bit is automatically cleared to “0”
by H/W circuit.
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Publication Release Date: January 17, 2005
Revision A.2