UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1046 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
41.7.2.1.2
Transmitter master mode (PCLK), with MCLK output
Table 913.
Transmitter master mode (PCLK), with MCLK output
CREG bit 12 DAO bit 5
TXMODE
bits [3:0]
Description
0
0
1 0 0 0
Transmitter master mode.
The I2S transmit function operates as a master.
The transmit clock source (TX_MCLK) is derived from PCLK using the
fractional divider.
The WS used is the internally generated TX_WS.
The TX_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 136.
Transmitter master mode (PCLK), with MCLK output
I
2
S
peripheral
block
I2STXMODE[1:0]=00
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]=1
Pin OE
I2S_TX_SCK
01
I2SDAO[5]=0
0
1
CREG6[12]=0
0
1
PLLAUDIO
PCLK
I2STXMODE[2]=0