參數(shù)資料
型號(hào)： DSP56857E
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： 16-bit Digital Signal Controllers
中文描述： 16位數(shù)字信號(hào)控制器
文件頁(yè)數(shù)： 27/53頁(yè)
文件大?。?/td> 680K
代理商： DSP56857E
External Clock Operation
56857 Technical Data, Rev. 6
Freescale Semiconductor
27
4.5 External Clock Operation
The 56857 system clock can be derived from a crystal or an external system clock signal. To generate a
reference frequency using the internal oscillator, a reference crystal must be connected between the
EXTAL and XTAL pins.
4.5.1
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 4-6
. In
Figure 4-6
a typical crystal oscillator circuit is
shown. Follow the crystal supplier’s recommendations when selecting a crystal, because 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 4-6 Crystal Oscillator
4.5.2
The recommended method of connecting an external clock is given in
Figure 4-7
.
The external clock
source is connected to XTAL and the EXTAL pin is held at ground, V
DDA
, or V
DDA
/2. The TOD_SEL bit
in CGM must be set to 0.
High Speed External Clock Source (> 4MHz)
Figure 4-7 Connecting a High Speed External Clock Signal using XTAL
4.5.3
The recommended method of connecting an external clock is given in
Figure 4-8
.
The external clock
source is connected to XTAL and the EXTAL pin is held at V
DDA
/2. The TOD_SEL bit in CGM must be
set to 0.
Low Speed External Clock Source (2-4MHz)
Sample External Crystal Parameters:
R
z
= 10M
Ω
TOD_SEL bit in CGM must be set to 0
Crystal Frequency = 2–4MHz (optimized for 4MHz)
EXTAL XTAL
R
z
56857
XTAL
EXTAL
External
Clock
(up to 240MHz)
GND,
V
DDA
,
or V
DDA
/2
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