TMP92CF30
2009-06-12
92CF30-477
3.18.3 Description of Operation
(1)
Settings the transfer clock generator and Word Select signal
In the I
2
S unit, the clock frequencies for the I2S0CKO and I2S0WS signals are
generated using the system clock (f
SYS
) as a source clock. The system clock is divided by
a prescaler and a dedicated clock generator to set the transfer clock and sampling
frequency.
The counters are started by setting I2S0CTL<CNTE0> to “1” and are stopped and
cleared by setting <CNTE0> to “0”.
A)
Clock generator
•
8-bit counter
This is an 8-bit counter that generates the I2S0CKO signal by dividing the
clock selected by I2S0CTL<CLKS0>.
•
6-bit counter
This is a 6-bit counter that generates the I2S0WS signal by dividing the
I2S0CKO signal.
B)
Word Select
•
Word Select signal (I2S0WS)
The I2S0WS signal is used to distinguish the position of valid data and
whether left data or right data is being transmitted in the I
2
S format. This
signal is clocked out in synchronization with the data transfer clock. In only
channel 0, this signal can be used as an AD conversion trigger signal for the
ADC. How valid data is to be output in relation to the WS signal can be
specified as I
2
S format, left-justified, or right-justified. In only channel 0, an
interrupt request can be output to the ADC on the rising edge of the WS signal.
(This is controlled by the ADC’s control register.)
(2)
Data format
This circuit support I
2
S format, left justify and right justify format by setting
I2S0CTL<DTFMT01:00> register. And support stereo and monaural both, controlled
by I2S0CTL<FSEL0> register.
Содержание TLCS-900/H1 Series
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