參數(shù)資料
型號: MC56F8355MFG60
廠商: MOTOROLA INC
元件分類: 數(shù)字信號處理
英文描述: 4-BIT, 120 MHz, OTHER DSP, PQFP128
封裝: LQFP-128
文件頁數(shù): 77/152頁
文件大小: 2224K
代理商: MC56F8355MFG60
30
56F8355 Technical Data
Preliminary
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.
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’s 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’s 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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