54.3.10 I
2
S Transmit Clock Control Registers (I2Sx_TCCR)
The I2S Transmit and Receive Control (TCCR and RCCR) registers are 19-bit, read/write
control registers used to direct the operation of the I2S. The Clock and Reset Module
(CRM) can source the I2S clock (network clock) from multiple sources and perform
fractional division to support commonly used audio bit rates. The CRM can maintain the
network clock frequency at a constant rate even in cases where the peripheral clock
frequency changes. These registers control the I2S clock generator, bit and frame sync
rates, word length, and number of words per frame for the serial data. The TCCR register
is dedicated to the transmit section, and the RCCR register is dedicated to the receive
section except in Synchronous mode, in which the TCCR register controls both the
receive and transmit sections. Power-on reset clears all TCCR and RCCR bits. I2S reset
does not affect the TCCR and RCCR bits. The control bits are described in the following
paragraphs. Although the bit patterns of the TCCR and RCCR registers are the same, the
contents of these two registers can be programmed differently.
Addresses: I2S0_TCCR is 4002_F000h base + 24h offset = 4002_F024h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
I2Sx_TCCR field descriptions
Field
Description
31–19
Reserved
This read-only field is reserved and always has the value zero.
18
DIV2
Divide By 2.
This bit controls a divide-by-two divider in series with the rest of the prescalers.
0
Divider bypassed.
1
Divider used to divide clock by 2.
17
PSR
Prescaler Range.
This bit controls a fixed divide-by-eight prescaler in series with the variable prescaler. It extends the range
of the prescaler for those cases where a slower bit clock is required.
0
Prescaler bypassed.
1
Prescaler used to divide clock by 8.
16–13
WL
Word Length Control.
Specifies the number of bits per data word being transferred by the I
2
S. These bits control the Word
Length Divider in the Clock Generator. They also control the frame sync pulse length when the FSL bit is
cleared. In I2S Master mode, the I
2
S works with a fixed word length of 32, and the WL bits are used to
Table continues on the next page...
Chapter 54 Integrated interchip sound (I2S)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
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