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UM10503
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User manual
Rev. 1.3 — 6 July 2012
1036 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
41.6.2 I2S Digital Audio Input register
The DAI register controls the operation of the I2S receive channel. The function of bits in
DAI are shown in
.
41.6.3 I2S Transmit FIFO register
The TXFIFO register provides access to the transmit FIFO.
41.6.4 Receive FIFO register
The I2SRXFIFO register provides access to the receive FIFO.
3
STOP
When 1, disables accesses on FIFOs, places the transmit channel in mute
mode.
0
4
RESET
When 1, asynchronously resets the transmit channel and FIFO.
0
5
WS_SEL
When 0, the interface is in master mode. When 1, the interface is in slave
mode.
1
14:6
WS_HALFPERIOD
Word select half period minus 1, i.e. WS 64clk period -> ws_halfperiod = 31.
0x1F
15
MUTE
When 1, the transmit channel sends only zeroes.
1
31:16 -
Reserved, user software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
-
Table 898. I2S Digital Audio Output register (DAO - address 0x400A 2000 (I2S0) and 0x400A 3000 (I2S1)) bit
description
Bit
Symbol
Value Description
Reset
value
Table 899. I2S Digital Audio Input register (DAI - address 0x400A 2004 (I2S0) and 0x400A 3004 (I2S1)) bit description
Bit
Symbol
Valu
e
Description
Reset
value
1:0
WORDWIDTH
Selects the number of bytes in data as follows:
01
0x0
8-bit data
0x1
16-bit data
0x2
Reserved, do not use this setting
0x3
32-bit data
2
MONO
When 1, data is of monaural format. When 0, the data is in stereo format.
0
3
STOP
When 1, disables accesses on FIFOs, places the transmit channel in mute
mode.
0
4
RESET
When 1, asynchronously reset the transmit channel and FIFO.
0
5
WS_SEL
When 0, the interface is in master mode. When 1, the interface is in slave
mode.
1
14:6
WS_HALFPERIOD
Word select half period minus 1, i.e. WS 64clk period -> ws_halfperiod = 31. 0x1F
31:15
-
Reserved, user software should not write ones to reserved bits. The value
read from a reserved bit is not defined.
-
Table 900. Transmit FIFO register (TXFIFO - address 0x400A 2008 (I2S0) and 0x400A 3008 (I2S1)) bit description
Bit
Symbol
Description
Reset value
31:0
I2STXFIFO
8 x 32-bit transmit FIFO.
0