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UM10503
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User manual
Rev. 1.3 — 6 July 2012
1053 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
41.7.2.2.2
Receiver master mode (PCLK), with MCLK output
Table 920.
Receiver master mode (PCLK), with MCLK output
CREG bit 13 DAI bit 5
RXMODE
bits [3:0]
Description
0
0
1 0 0 0
Receiver master mode.
The I2S receive function operates as a master.
The receive clock source (RX_MCLK) is derived from PCLK using the
fractional divider.
The WS used is the internally generated RX_WS.
The RX_MCLK pin is enabled for output.
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 143.
Receiver master mode (PCLK), with MCLK output
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]=1
I2S_RX_SCK
Pin OE
0
1
00
0
1
CREG6[13]=0
0
1
PLLAUDIO
I2SRXMODE[2]=0
PCLK