DSPIC30F5011-20I/PTG Microchip Technology, DSPIC30F5011-20I/PTG Datasheet - Page 123

• Manufacturer Part Number: DSPIC30F5011-20I/PTG
• Description: IC, DSC, 16BIT, 66KB, 40MHZ 5.5V TQFP-64
• Manufacturer: Microchip Technology
• Series: DsPIC30Fr

Specifications of DSPIC30F5011-20I/PTG

• Core Frequency: 40MHz
• Core Supply Voltage: 5.5V
• Embedded Interface Type: CAN, I2C, SPI, UART
• No. Of I/o's: 52
• Flash Memory Size: 66KB
• Supply Voltage Range: 2.5V To 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

18.3.7
The DCI module has a dedicated 12-bit time base that
produces the bit clock. The bit clock rate (period) is set
by writing a non-zero 12-bit value to the BCG<11:0>
control bits in the DCICON3 SFR.
When the BCG<11:0> bits are set to zero, the bit clock
will be disabled. If the BCG<11:0> bits are set to a
non-zero value, the bit clock generator is enabled.
These bits should be set to ‘0’ and the CSCKD bit set
to ‘1’ if the serial clock for the DCI is received from an
external device.
The formula for the bit clock frequency is given in
Equation 18-2.
TABLE 18-1:
© 2008 Microchip Technology Inc.
Note 1:
F
S
44.1
(KH
2:
12
32
48
8
Z
When the CSCK signal is applied externally (CSCKD = 1), the external clock high and low times must
meet the device timing requirements.
When the CSCK signal is applied externally (CSCKD = 1), the BCG<11:0> bits have no effect on the
operation of the DCI module.
BIT CLOCK GENERATOR
)
DEVICE FREQUENCIES FOR COMMON CODEC CSCK FREQUENCIES
F
CSCK
256
256
32
32
64
/F
S
F
CSCK
1.4112
2.048
3.072
1,024
3.072
(MH
Z
)
(1)
F
OSC
5.6448
8.192
6.144
8.192
6.144
(MH
EQUATION 18-2:
The required bit clock frequency will be determined by
the system sampling rate and frame size. Typical bit
clock frequencies range from 16x to 512x the converter
sample rate depending on the data converter and the
communication protocol that is used.
To achieve bit clock frequencies associated with
common audio sampling rates, the user will need to
select a crystal frequency that has an ‘even’ binary
value. Examples of such crystal frequencies are listed
in Table 18-1.
dsPIC30F5011/5013
Z
)
PLL
16
4
8
8
8
F
BCK
=
BIT CLOCK FREQUENCY
F
2 (BCG + 1)
CYC
•
11.2896
12.288
16.384
24.576
8.192
F
(MIPS)
CY
DS70116H-page 123
BCG
1
1
7
3
3
(2)