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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1217 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
44.7.2.1.2
Transmitter master mode (PCLK), with MCLK output
Table 1016.
Transmitter master mode (PCLK), with MCLK output
CREG bit 12 DAO bit 5
TXMODE
bits [3:0]
Description
0
0
1 0 0 0
Transmitter master mode.
The I2S transmit function operates as a master.
The transmit clock source (TX_MCLK) is derived from PCLK using the
fractional divider.
The WS used is the internally generated TX_WS.
The TX_MCLK pin is enabled for output.
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 PLL0AUDIO for the I2S1 interface.
Fig 149.
Transmitter master mode (PCLK), with MCLK output
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
TX_RATE[15:8]
TX_RATE[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]=1
Pin OE
I2S_TX_SCK
01
DAO[5]=0
0
1
CREG6[12]=0
0
1
PCLK
TXMODE[2]=0
BASE_AUDIO_CLK