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UM10503
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User manual
Rev. 2.1 — 10 December 2015
561 of 1441
NXP Semiconductors
UM10503
Chapter 22: LPC43xx/LPC43Sxx SD/MMC interface
22.6.23 Transferred CIU Card Byte Count Register
22.6.24 Transferred Host to BIU-FIFO Byte Count Register
22.6.25 Debounce Count Register
22.6.26 Hardware Reset
Table 380. 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 381. 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 382. Debounce Count Register (DEBNCE, address 0x4000 4064) bit description
Bit
Symbol
Description
Reset
value
23:0
DEBOUNCE_
COUNT
Number of host clocks (SD_CLK) used by debounce
filter logic for card detect; typical debounce time is
5-25 ms.
0xFFFFFF
31:24
-
Reserved
Table 383. 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