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UM10503
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User manual
Rev. 2.1 — 10 December 2015
1227 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
44.7.2.2.5
4-Wire Receiver mode
Table 1026.
4-Wire Receiver mode
CREG bit 13 DAI bit 5
RXMODE
bits [3:0]
Description
x
1
0 1 x x
4-wire receiver mode sharing the transmitter TX_SCK and TX_WS (4-pin mode).
The I2S receive function operates as an internal slave to the transmit function.
The transmit function can operate in either master or slave mode, determining
the operating mode of the entire I2S interface.
The receive clock source is TX_SCK.
The WS used is the internally generated TX_WS.
The RX_MCLK pin is not enabled for output.
Bold lines indicate the clock path for this configuration.
Fig 159.
4-Wire Receiver mode
I
2
S
peripheral
block
1
0
RXMODE[2]=1
TX_SCK
RX_SCK
(1 to 64)
TX_MCLK
RX_MCLK
8-bit
Fractional
Rate Divider
X
Y
DAI[5]=1
TXRATE[15:8]
TXRATE[7:0]
01
10
RXMODE[1:0]=XX
RXBITRATE[5:0]
1
0
TX_WS
RX_WS
I2S_RX_WS
DAI[5]=1
Pin OEn
I2S_RX_SDA
I2S_RX_MCLK
RXMODE[3]=0
I2S_RX_SCK
Pin OE
0
1
00
0
1
CREG6[13]=X
0
1
PCLK
RXMODE[2]=1
BASE_AUDIO_CLK