UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1047 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
41.7.2.1.3
Transmitter master mode, sharing RX_MCLK
Table 914.
Transmitter master mode, sharing RX_MCLK
CREG bit 12 DAO bit 5
TXMODE
bits [3:0]
Description
x
0
0 0 1 0
Transmitter master mode sharing the receiver reference clock (RX_MCLK).
The I2S transmit function operates as a master.
The transmit clock source is RX_MCLK.
The WS used is the internally generated TX_WS.
The TX_MCLK pin is not enabled for output.
Bold lines indicate the clock path for this configuration.
Fig 137.
Transmitter master mode, sharing RX_MCLK
I
2
S
peripheral
block
I2STXMODE[1:0]=10
I2STXMODE[2]=0
0
1
TX_SCK
RX_SCK
(1 to 64)
TX_MCLK
10
00
8-bit
Fractional
Rate Divider
X
Y
I2STX_RATE[15:8]
I2STX_RATE[7:0]
1
0
I2STXBITRATE[5:0]
RX_MCLK
0
1
TX_WS
RX_WS
I2SDAO[5]=0
Pin OEn
I2S_TX_WS
I2S_TX_SDA
I2S_TX_MCLK
I2STXMODE[3]=0
Pin OE
I2S_TX_SCK
01
I2SDAO[5]=0
0
1
CREG6[12]=X
0
1
PLLAUDIO
PCLK
I2STXMODE[2]=0