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UM10503
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User manual
Rev. 2.1 — 10 December 2015
1226 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
44.7.2.2.4
Typical Receiver slave mode
Table 1025.
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 158.
Typical Receiver slave mode
I
2
S
peripheral
block
1
0
RXMODE[2]=0
TX_SCK
RX_SCK
(1 to 64)
TX_MCLK
RX_MCLK
8-bit
Fractional
Rate Divider
X
Y
DAI[5]=1
TXRATE[15:8]
TXRATE[7:0]
01
10
RXMODE[1:0]=00
RXBITRATE[5:0]
1
0
TX_WS
RX_WS
I2S_RX_WS
DAI[5]=1
Pin OEn
I2S_RX_SDA
I2S_RX_MCLK
RXMODE[3]=0
I2S_RX_SCK
Pin OE
0
1
00
0
1
CREG6[13]=X
0
1
PCLK
RXMODE[2]=0
BASE_AUDIO_CLK