UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
416 of 1269
NXP Semiconductors
UM10503
Chapter 20: LPC43xx SD/MMC interface
20.6 Register description
SD_VOLT[2:0]
O
SD/MMC bus voltage select output 2:0. On the LPC43xx,
these pins only function as GPIO pins. The SD/MMC
controller voltage cannot be changed.
SD_RST
O
SD/MMC reset signal for MMC4.4 card.
SD_POW
O
SD/SDIO/MMC slot power enable
Table 295. SDIO pin description
Pin function
Direction Description
Table 296. Register overview: SDMMC (base address: 0x4000 4000)
Name
Access
Address
offset
Description
Reset value
Reference
CTRL
R/W
0x000
Control Register
0
PWREN
R/W
0x004
Power Enable Register
0
CLKDIV
R/W
0x008
Clock Divider Register
0
CLKSRC
R/W
0x00C
SD Clock Source Register
0
CLKENA
R/W
0x010
Clock Enable Register
0
TMOUT
R/W
0x014
Time-out Register
CTYPE
R/W
0x018
Card Type Register
0
BLKSIZ
R/W
0x01C
Block Size Register
0x200
BYTCNT
R/W
0x020
Byte Count Register
0x200
INTMASK
R/W
0x024
Interrupt Mask Register
CMDARG
R/W
0x028
Command Argument Register
0x00000000
CMD
R/W
0x02C
Command Register
0x00000000
RESP0
R
0x030
Response Register 0
0x00000000
RESP1
R
0x034
Response Register 1
0x00000000
RESP2
R
0x038
Response Register 2
0
RESP3
R
0x03C
Response Register 3
0
MINTSTS
R
0x040
Masked Interrupt Status Register
0
RINTSTS
R/W
0x044
Raw Interrupt Status Register
0
STATUS
R
0x048
Status Register
FIFOTH
R/W
0x04C
FIFO Threshold Watermark Register
0x0F80 0000
CDETECT
R
0x050
Card Detect Register
WRTPRT
R
0x054
Write Protect Register
-
-
0x058
Reserved
-
-
TCBCNT
R
0x05C
Transferred CIU Card Byte Count Register
0x00000000
TBBCNT
R
0x060
Transferred Host to BIU-FIFO Byte Count
Register
0
DEBNCE
R/W
0x064
Debounce Count Register
-
-
0x068
Reserved
-
-
-
-
0x06C
Reserved
-
-
-
-
0x070
Reserved
-
-
-
-
0x074
Reserved
-
-