UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
433 of 1269
NXP Semiconductors
UM10503
Chapter 20: LPC43xx SD/MMC interface
20.6.22 Write Protect Register (WRTPRT)
20.6.23 Transferred CIU Card Byte Count Register (TCBCNT)
20.6.24 Transferred Host to BIU-FIFO Byte Count Register (TBBCNT)
20.6.25 Debounce Count Register (DEBNCE)
20.6.26 Hardware Reset (RST_N)
Table 318. Write Protect Register (WRTPRT, address 0x4000 4054) bit description
Bit
Symbol
Description
Reset
value
0
WRITE_PROTECT
Write protect. 1 represents write protection.
0
31:1
-
Reserved
-
Table 319. Transferred CIU Card Byte Count Register (TCBCNT, address 0x4000 405C) bit description
Bit
Symbol
Description
Reset
value
31:0
TRANS_CARD_BYTE_
COUNT
Number of bytes transferred by CIU unit to card.
Register should be read only after data transfer completes; during data transfer,
register returns 0.
0
Table 320. Transferred Host to BIU-FIFO Byte Count Register (TBBCNT, address 0x4000 4060) bit description
Bit
Symbol
Description
Reset
value
31:0
TRANS_FIFO_BYTE_
COUNT
Number of bytes transferred between Host/DMA memory and BIU FIFO.
0
Table 321. Debounce Count Register (DEBNCE, address 0x4000 4064) bit description
Bit
Symbol
Description
Reset
value
23:0
DEBOUNCE_
COUNT
Number of host clocks (clk) used by debounce filter
logic for card detect; typical debounce time is 5-25
ms.
0xFFFFFF
31:24
-
Reserved
Table 322. Hardware Reset (RST_N, address 0x4000 4078) bit description
Bit
Symbol
Description
Reset
value
0
CARD_RESET
Hardware reset.
1 - Active mode
0 - Reset
Toggles state on SD_RST pin.
This bit causes the
card to enter pre-idle state, which requires it to be
re-initialized.
1
31:1
-
Reserved