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UM10503
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User manual
Rev. 1.3 — 6 July 2012
1055 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
41.7.2.2.4
Typical Receiver slave mode
Table 922.
Typical Receiver slave mode
CREG bit 13 DAI bit 5
RXMODE
bits [3:0]
Description
x
1
0 0 0 0
Typical receiver slave mode.
The I2S receive function operates as a slave.
The receive clock source RX_SCK is provided by the external master on the
RX_SCK pin. The receive bit rate divider must be set to 1
(RXBITRATE[5:0]=000000) for this mode to operate correctly.
The WS signal is provided by the external master on the RX_WS pin.
Bold lines indicate the clock path for this configuration.
Fig 145.
Typical Receiver slave mode
I
2
S
peripheral
block
1
0
I2SRXMODE[2]=0
TX_SCK
RX_SCK
(1 to 64)
TX_MCLK
RX_MCLK
8-bit
Fractional
Rate Divider
X
Y
I2SDAI[5]=1
I2STX_RATE[15:8]
I2STX_RATE[7:0]
01
10
I2SRXMODE[1:0]=00
I2SRXBITRATE[5:0]
1
0
TX_WS
RX_WS
I2S_RX_WS
I2SDAI[5]=1
Pin OEn
I2S_RX_SDA
I2S_RX_MCLK
I2SRXMODE[3]=0
I2S_RX_SCK
Pin OE
0
1
00
0
1
CREG6[13]=X
0
1
PLLAUDIO
PCLK
I2SRXMODE[2]=0