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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1213 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
44.6.14 I2S Receive Mode Control register
The Receive Mode Control register contains additional controls for receive clock source,
enabling the 4-pin mode
(SCK and WS signals are shared between I2S transmit and receive
blocks)
, and how MCLK is used.
Table 1013.I2S Transmit Mode Control register (TXMODE, address 0x400A 2030 (I2S0) and
0x400A 3030 (I2S1)) bit description
Bit
Symbol
Value Description
Reset
value
1:0
TXCLKSEL
Clock source selection for the transmit bit clock divider.
0
0x0
Tx fractional rate divider. Select the TX fractional rate divider
clock output as the source
0x1
Reserved
0x2
RX_MCLK. Select the RX_MCLK signal as the TX_MCLK
clock source
0x3
Reserved
2
TX4PIN
Transmit 4-pin mode selection (SCK and WS signals are
shared between I2S transmit and receive blocks). When 1,
enables 4-pin mode.
0
3
TXMCENA
Enable for the TX_MCLK output. When 0, output of
TX_MCLK is not enabled. When 1, output of TX_MCLK is
enabled.
0
31:4
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA
Table 1014.I2S Receive Mode Control register (RXMODE, address 0x400A 2034 (I2S0) and
0x400A 3034 (I2S1)) bit description
Bit
Symbol
Value Description
Reset
value
1:0
RXCLKSEL
Clock source selection for the receive bit clock divider.
0
0x0
RX fractional divider. Select the RX fractional rate divider
clock output as the source
0x1
BASE_AUDIO_CLK or I2S_RX_MCLK. Select
BASE_AUDIO_CLK or I2S_RX_MCLK as the clock source.
0x2
TX_MCLK. Select the TX_MCLK signal as the RX_MCLK
clock source
0x3
Reserved
2
RX4PIN
Receive 4-pin mode selection (SCK and WS signals are
shared between I2S transmit and receive blocks). When 1,
enables 4-pin mode.
0
3
RXMCENA
Enable for the RX_MCLK output. When 0, output of
RX_MCLK is not enabled. When 1, output of RX_MCLK is
enabled.
0
31:4
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
NA