LM3S5951 Datasheet, PDF (238/1261 Pages) Texas Instruments – Stellaris® LM3S5951 Microcontroller

System Control
Register 15: I²S MCLK Configuration (I2SMCLKCFG), offset 0x170
This register configures the receive and transmit fractional clock dividers for the for the I²S master
transmit and receive clocks (I2S0TXMCLK and I2S0RXMCLK). Varying the integer and fractional
inputs for the clocks allows greater accuracy in hitting the target I²S clock frequencies. Refer to
“Clock Control” on page 774 for combinations of the TXI and TXF bits and the RXI and RXF bits that
provide MCLK frequencies within acceptable error limits.
I2S MCLK Configuration (I2SMCLKCFG)
Base 0x400F.E000
Offset 0x170
Type R/W, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
RXEN reserved
RXI
RXF
Type R/W
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
TXEN reserved
TXI
TXF
Type R/W
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31
Name
RXEN
Type
R/W
Reset
0
Description
RX Clock Enable
Value Description
1
The I²S receive clock generator is enabled.
0
The I²S receive clock generator is disabled.
If the RXSLV bit in the I²S Module Configuration (I2SCFG)
register is set, then the I2S0RXMCLK must be externally
generated.
30
29:20
19:16
15
reserved
RXI
RXF
TXEN
RO
0
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
R/W
0x0
RX Clock Integer Input
This field contains the integer input for the receive clock generator.
R/W
0x0
RX Clock Fractional Input
This field contains the fractional input for the receive clock generator.
R/W
0
TX Clock Enable
Value Description
1
The I²S transmit clock generator is enabled.
0
The I²S transmit clock generator is disabled.
If the TXSLV bit in the I²S Module Configuration (I2SCFG)
register is set, then the I2S0TXMCLK must be externally
generated.
238
January 20, 2012
Texas Instruments-Production Data