Multimedia Card Registers
18.5.1.6 SD_PWCNT Register (offset = 130h) [reset = 0h]
SD_PWCNT is shown in
and described in
.
This register is used to program a mmc counter to delay command transfers after activating the PAD
power, this value depends on PAD characteristics and voltage.
Figure 18-42. SD_PWCNT Register
31
30
29
28
27
26
25
24
Reserved
R-0h
23
22
21
20
19
18
17
16
Reserved
R-0h
15
14
13
12
11
10
9
8
PWRCNT
R/W-0h
7
6
5
4
3
2
1
0
PWRCNT
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 18-25. SD_PWCNT Register Field Descriptions
Bit
Field
Type
Reset
Description
31-16
Reserved
R
0h
15-0
PWRCNT
R/W
0h
Power counter register.
This register is used to introduce a delay between the PAD ACTIVE
pin assertion and the command issued.
0x0 = No additional delay added
0x1 = TCF delay (card clock period)
0x2 = TCF x 2 delay (card clock period)
0xfffe = TCF x 65534 delay (card clock period)
0xffff = TCF x 65535 delay (card clock period)
3402
Multimedia Card (MMC)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated