TMP92CF30
2009-06-12
92CF30-480
•
Setting the sampling frequency WS
The sampling frequency is set by dividing the transfer clock (CK) described
above. A 6-bit counter is provided to divide the transfer clock by 16 to 64. (The
divider value cannot be set to 1 to 15.)
6-bit counter set value
Divider value
000000
64
000001
1
111111
63
When f
SYS
= 60 MHz, I2S0C<CK07:00>
=
150, and I2SnC<WS05:00>
=
50, the sampling
frequency is set as follows:
I2S0CKO = f
SYS
/ 150 / 50
= 60 [MHz] / 150 / 50 = 8 [kHz]
Based on the above, the transfer clock is set to 400 kbps, and the sampling frequency is
set to 8 kHz in this example.
Note 1: The value to be set in I2S0C<WS05:00> must be 16 or larger (18 or larger for I
2
S transfer) when the data
length is 8 bits and 32 or larger (34 or larger for I
2
S transfer) when the data length is 16 bits.
Note 2: It is recommended that the value to be set in I2S0C<WS05:00> be an even number. Although it is possible to
set an odd number, the clock duty of the WS signal does not become 50%. Setting an odd number causes the
High width of the WS signal to become longer by one I2S0CKO pulse than the Low width.
•
Special function
As a special function available only in channel 0, the rising edge of the WS
signal can be used as an AD conversion start trigger for the AD converter in this
LSI. Setting I2S0CTL<SYSKE0>=1 and I2S0CTL<CNTE0>=1 enables the WS
signal to be sent to the AD converter. This can be done regardless of the setting of
I2S0CTL<TXE0>.
For details about AD conversion using the WS signal, refer to the chapter on the
AD converter.
Содержание TLCS-900/H1 Series
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