MC56F8347 Freescale Semiconductor, Inc, MC56F8347 Datasheet - Page 39
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MC56F8347
Manufacturer Part Number
MC56F8347
Description
56f8300 16-bit Digital Signal Controllers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC56F8347.pdf
(172 pages)
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parameters determine the component values required to provide maximum stability and reliable start-up.
The crystal and associated components should be mounted as near as possible to the EXTAL and XTAL
pins to minimize output distortion and start-up stabilization time.
Note:
3.2.2
It is also possible to drive the internal oscillator with a ceramic resonator, assuming the overall system
design can tolerate the reduced signal integrity. A typical ceramic resonator circuit is shown in
Refer to the supplier’s recommendations when selecting a ceramic resonator and associated components.
The resonator and components should be mounted as near as possible to the EXTAL and XTAL pins.
Note:
Freescale Semiconductor
Preliminary
CLKMODE = 0
2 Terminal
CL1
The OCCS_COHL bit must be set to 1 when a crystal oscillator is used. The reset condition on the
OCCS_COHL bit is 0. Please see the COHL bit in the Oscillator Control (OSCTL) register, discussed
in the 56F8300 Peripheral User’s Manual.
Ceramic Resonator (Default)
The OCCS_COHL bit must be set to 0 when a ceramic resonator is used. The reset condition on the
OCCS_COHL bit is 0. Please see the COHL bit in the Oscillator Control (OSCTL) register, discussed
in the 56F8300 Peripheral User’s Manual.
EXTAL
CL1
R
z
EXTAL XTAL
XTAL
CL2
R
Figure 3-2 Connecting to a Crystal Oscillator
Figure 3-3 Connecting a Ceramic Resonator
z
Resonator Frequency = 4 - 8MHz (optimized for 8MHz)
Crystal Frequency = 4 - 8MHz (optimized for 8MHz)
CL2
EXTAL XTAL
C1
3 Terminal
EXTAL
56F8347 Technical Data, Rev.11
R
z
R
z
XTAL
C2
Sample External Ceramic Resonator Parameters:
R
z
Sample External Crystal Parameters:
R
Note: If the operating temperature range is limited to
below 85
= 750 KΩ
z
= 750 KΩ
o
C (105
CLKMODE = 0
o
C junction), then R
z
External Clock Operation
= 10 Meg Ω
Figure
3-3.
39
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