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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1058 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
41.7.2.2.7
Receiver master mode (External MCLK)
41.7.3 FIFO controller
Handling of data for transmission and reception is performed via the FIFO controller which
can generate two DMA requests and an interrupt request. The controller consists of a set
of comparators which compare FIFO levels with depth settings contained in registers. The
current status of the level comparators can be seen in the APB status register.
Table 925.
Receiver master mode (External MCLK)
CREG bit 13 DAI bit 5
RXMODE
bits [3:0]
Description
0
0
0 0 0 1
Receiver master mode.
The I2S receive function operates as a master.
The receive clock source (RX_MCLK) is provided by the external master on the
RX_MCLK pin.
The WS used is the internally generated RX_WS.
The RX_MCLK pin is enabled for input.
Bold lines indicate the clock path for this configuration. CREG6 bits 12 and 13 select PLL0AUDIO for the I2S0 interface. CREG
bits 14 and 15 select PLL0AUDIO for the I2S1 interface.
Fig 148.
Receiver master mode (External MCLK)
I
2
S
peripheral
block
1
0
I2SRXMODE[2]=0
TX_SCK
RX_SCK
(1 to 64)
TX_MCLK
RX_MCLK
8-bit
Fractional
Rate Divider
X
Y
I2SDAI[5]=0
I2STX_RATE[15:8]
I2STX_RATE[7:0]
01
10
I2SRXMODE[1:0]=00
I2SRXBITRATE[5:0]
1
0
TX_WS
RX_WS
I2S_RX_WS
I2SDAI[5]=0
Pin OEn
I2S_RX_SDA
I2S_RX_MCLK
I2SRXMODE[3]=0
I2S_RX_SCK
Pin OE
0
1
00
0
1
CREG6[13]=0
0
1
PLLAUDIO
PCLK
I2SRXMODE[2]=0