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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1203 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
44.5 Pin description
Table 998. Pin description
Pin function
Direction
Description
I2S0/1_RX_SCK
Input/
Output
Receive Clock. A clock signal used to synchronize the transfer of data on the receive
channel. It is driven by the master and received by the slave. Corresponds to the signal
SCK in the I2S bus specification.
I2S0/1_RX_WS
Input/
Output
Receive Word Select. Selects the channel from which data is to be received. It is driven
by the master and received by the slave. Corresponds to the signal WS in the I2S bus
specification.
WS = 0 indicates that data is being received by channel 1 (left channel).
WS = 1 indicates that data is being received by channel 2 (right channel).
I2S0/1_RX_SDA
Input/
Output
Receive Data. Serial data, received MSB first. It is driven by the transmitter and read by
the receiver. Corresponds to the signal SD in the I2S bus specification.
I2S0/1_RX_MCLK
Output
Optional master clock output for the I2S receive function.
I2S0/1_TX_SCK
Input/
Output
Transmit Clock. A clock signal used to synchronize the transfer of data on the transmit
channel. It is driven by the master and received by the slave. Corresponds to the signal
SCK in the I2S bus specification.
I2S0/1_TX_WS
Input/
Output
Transmit Word Select. Selects the channel to which data is being sent. It is driven by the
master and received by the slave. Corresponds to the signal WS in the I2S bus
specification.
WS = 0 indicates that data is being sent to channel 1 (left channel).
WS = 1 indicates that data is being sent to channel 2 (right channel).
I2S0/1_TX_SDA
Input/
Output
Transmit Data. Serial data, sent MSB first. It is driven by the transmitter and read by the
receiver. Corresponds to the signal SD in the I2S bus specification.
IS0/1_TX_MCLK
Output
Optional master clock output for the I2S transmit function.