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UM10503
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User manual
Rev. 2.1 — 10 December 2015
1219 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
44.7.2.1.4
Typical Transmitter slave mode
Table 1018.
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 151.
Typical Transmitter slave mode
I
2
S
peripheral
block
TXMODE[1:0]=00
TXMODE[2]=0
0
1
TX_SCK
RX_SCK
(1 to 64)
TX_MCLK
10
00
8-bit
Fractional
Rate Divider
X
Y
TXRATE[15:8]
TXRATE[7:0]
1
0
TXBITRATE[5:0]
RX_MCLK
0
1
TX_WS
RX_WS
DAO[5]=1
Pin OEn
I2S_TX_WS
I2S_TX_SDA
I2S_TX_MCLK
TXMODE[3]=0
Pin OE
I2S_TX_SCK
01
DAO[5]=1
0
1
CREG6[12]=X
0
1
PCLK
TXMODE[2]=0
BASE_AUDIO_CLK