參數(shù)資料
型號: MC56F8357
廠商: Motorola, Inc.
元件分類: 數(shù)字信號處理
英文描述: 16-bit Digital Signal Processor
中文描述: 16位數(shù)字信號處理器
文件頁數(shù): 33/160頁
文件大?。?/td> 1394K
代理商: MC56F8357
External Clock Operation
56F8357 Technical Data
Preliminary
33
3.2 External Clock Operation
The 56F8357 system clock can be derived from an external crystal, ceramic resonator, or an
external system clock signal. To generate a reference frequency using the internal oscillator, a
reference crystal or ceramic resonator must be connected between the EXTAL and XTAL pins.
3.2.1
Crystal Oscillator
The internal oscillator is also designed to interface with a parallel-resonant crystal resonator in the
frequency range specified for the external crystal in
Table 10-13
. 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 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
.
Sample External Crystal Parameters:
R
z
= 750 K
Note: If the operating temperature range is limited to
below 85
o
C
(105
o
C junction), then R
z
= 10 Meg
CLKMODE = 0
EXTAL XTAL
R
z
CL1
CL2
Crystal Frequency = 4 - 8MHz (optimized for 8MHz)
EXTAL XTAL
R
z
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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