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UM10503
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User manual
Rev. 1.3 — 6 July 2012
1048 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
41.7.2.1.4
Typical Transmitter slave mode
Table 915.
Typical Transmitter slave mode
CREG bit 12 DAO bit 5 TXMODE
bits [3:0]
Description
x
1
0 0 0 0
Typical transmitter slave mode.
The I2S transmit function operates as a slave.
The transmit clock source TX_SCK is provided by the external master on the
TX_SCK pin. The transmit bit rate divider must be set to 1
(TXBITRATE[5:0]=000000) for this mode to operate correctly.
The WS signal is provided by the external master on the TX_WS pin.
Bold lines indicate the clock path for this configuration.
Fig 138.
Typical Transmitter slave mode
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]=1
Pin OEn
I2S_TX_WS
I2S_TX_SDA
I2S_TX_MCLK
I2STXMODE[3]=0
Pin OE
I2S_TX_SCK
01
I2SDAO[5]=1
0
1
CREG6[12]=X
0
1
PLLAUDIO
PCLK
I2STXMODE[2]=0