參數(shù)資料
型號: SPAK56F8346FV60
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 數(shù)字信號處理
英文描述: 16-BIT, 240 MHz, OTHER DSP, PQFP144
封裝: 20 X 20 MM, 0.50 MM PITCH, 1.40 MM HEIGHT, PLASTIC, LQFP-144
文件頁數(shù): 82/156頁
文件大?。?/td> 2219K
代理商: SPAK56F8346FV60
External Clock Operation
MOTOROLA
56F8346 Technical Data
31
Preliminary
3.2.1
Crystal Oscillator
The internal oscillator is designed to interface with a parallel-resonant crystal resonator in the frequency
range specified for the external crystal in Table 10-16. A recommended crystal oscillator circuit is shown
in Figure 3-2. Follow the crystal supplier’s recommendations when selecting a crystal, since crystal
parameters determine the component values required to provide maximum stability and reliable start-up.
The crystal and associated components should be mounted as close 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 should 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 Section 5 of 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 supplier’s recommendations when selecting a ceramic resonator and associated components. The
resonator and components should be mounted as close as possible to the EXTAL and XTAL pins.
Figure 3-3 Connecting a Ceramic Resonator
Note:
The OCCS_COHL bit must 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 Section 5 of the 56F8300 Peripheral User Manual.
Sample External Crystal Parameters:
Rz = 750 K
Note: If the operating temperature range is limited to
below 85oC (105oC junction), then Rz = 10 Meg
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 K
EXTAL
XTAL
Rz
C1
CL1
CL2
C2
Resonator Frequency = 4 - 8MHz (optimized for 8MHz)
3 Terminal
2 Terminal
CLKMODE = 0
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