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| 型号： | SPAK56F826BU80 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | 16-BIT, 80 MHz, OTHER DSP, PQFP100 |
| 封装： | LQFP-100 |
| 文件页数： | 18/53页 |
| 文件大小： | 829K |
| 代理商： | SPAK56F826BU80 |
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External Clock Operation
MOTOROLA
DSP56F826 Preliminary Technical Data
25
3.6 External Clock Operation
The DSP56F826 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.
3.6.1
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 13. In Figure 11 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 11. Connecting to a Crystal Oscillator Circuit
3.6.2
Ceramic Resonator
It is also possible to drive the internal oscillator with a ceramic resonator, assuming the overall system
design can tolerate the reduced signal integrity. In Figure 12, a typical ceramic resonator circuit is shown.
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 12. Connecting a Ceramic Resonator
3.6.3
External Clock Source
The recommended method of connecting an external clock is given in Figure 13. The external clock
source is connected to XTAL and the EXTAL pin is held VDDA/2.
Sample External Crystal Parameters:
Rz = 10 M
fc = 4
EXTAL XTAL
Rz
fc
Sample Ceramic Resonator Parameters:
Rz = 10 M
fc = 4
EXTAL XTAL
Rz
fc
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