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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1223 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
44.7.2.2 I2S Receiver modes
44.7.2.2.1
Typical Receiver master mode (PCLK - no MCLK output)
Table 1022.
Typical Receiver master mode (PCLK - no MCLK output)
CREG bit 13 DAI bit 5
RXMODE
bits [3:0]
Description
x
0
0 0 0 0
Typical 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 not enabled for output.
Bold lines indicate the clock path for this configuration.
Fig 155. Typical Receiver master mode (PCLK - no MCLK output)
I
2
S
peripheral
block
1
0
RXMODE[2]=0
TX_SCK
RX_SCK
(1 to 64)
TX_MCLK
RX_MCLK
8-bit
Fractional
Rate Divider
X
Y
DAI[5]=0
TXRATE[15:8]
TXRATE[7:0]
01
10
RXMODE[1:0]=00
RXBITRATE[5:0]
1
0
RXMODE[2]=0
TX_WS
RX_WS
I2S_RX_WS
DAI[5]=0
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
BASE_AUDIO_CLK