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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1222 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
44.7.2.1.7
Transmitter master mode (External MCLK)
Table 1021.
Transmitter master mode (External MCLK)
CREG bit 12 DAO bit 5 TXMODE
bits [3:0]
Description
0
0
0 0 0 1
Transmitter master mode.
The I2S transmit function operates as a master.
The transmit clock source (TX_MCLK) is provided by the external master on the
TX_MCLK pin.
The WS used is the internally generated TX_WS.
The TX_MCLK pin is enabled for input.
Bold lines indicate the clock path for this configuration. CREG6 bits 12 and 13 select BASE_AUDIO_CLK for the I2S0 interface.
CREG bits 14 and 15 select BASE_AUDIO_CLK for the I2S1 interface.
Fig 154.
Transmitter master mode (External MCLK)
I
2
S
peripheral
block
TXMODE[1:0]=01
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]=0
Pin OEn
I2S_TX_WS
I2S_TX_SDA
I2S_TX_MCLK
TXMODE[3]=0
Pin OE
I2S_TX_SCK
01
DAO[5]=0
0
1
CREG6[12]=0
0
1
TXMODE[2]=0
PCLK
BASE_AUDIO_CLK