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56F8166 Datasheet(PDF) 39 Page - Freescale Semiconductor, Inc

Part # 56F8166
Description  16-bit Digital Signal Controllers
PDF  182 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

56F8166 Datasheet(HTML) 39 Page - Freescale Semiconductor, Inc

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External Clock Operation
56F8366 Technical Data, Rev. 7
Freescale Semiconductor
39
Preliminary
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.
Figure 3-2 Connecting to a Crystal Oscillator
Note:
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 Manual.
3.2.2
Ceramic Resonator (Default)
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 Figure 3-3.
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.
Figure 3-3 Connecting a Ceramic Resonator
Note:
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 Manual.
Sample External Crystal Parameters:
Rz = 750 KΩ
Note: If the operating temperature range is limited to
below 85oC (105oC junction), then Rz = 10 Meg Ω
CLKMODE = 0
EXTAL XTAL
Rz
CL1
CL2
Crystal Frequency = 4 - 8MHz (optimized for 8MHz)
EXTAL XTAL
Rz
EXTAL
XTAL
Rz
Sample External Ceramic Resonator Parameters:
Rz = 750 KΩ
EXTAL
XTAL
Rz
C1
CL1
CL2
C2
Resonator Frequency = 4 - 8MHz (optimized for 8MHz)
3 Terminal
2 Terminal
CLKMODE = 0



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