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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1045 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
41.7.2.1 I2S Transmitter modes
41.7.2.1.1
Typical transmitter master mode (PCLK - no MCLK output)
Table 912.
Typical transmitter master mode (PCLK - no MCLK output)
CREG bit 12 DAO bit 5
TXMODE
bits [3:0]
Description
x
0
0 0 0 0
Typical transmitter master mode. See
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 not enabled for output.
Bold lines indicate the clock path for this configuration.
Fig 135.
Typical transmitter master mode (PCLK - no 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
I2STXMODE[2]=0
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