DSP56F803EVM Freescale Semiconductor, DSP56F803EVM Datasheet - Page 28

• Manufacturer Part Number: DSP56F803EVM
• Description: KIT EVALUATION FOR DSP56F803
• Manufacturer: Freescale Semiconductor

Specifications of DSP56F803EVM

• Processor To Be Evaluated: 56F803
• Data Bus Width: 16 bit
• Interface Type: RS-232, JTAG
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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3.5.2
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
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. The internal 56F80x oscillator circuitry is designed to have no external load capacitors
present. As shown in
3.5.3
The recommended method of connecting an external clock is given in
source is connected to XTAL and the EXTAL pin is grounded.
Note: Freescale recommends only two terminal ceramic resonators vs. three terminal resonators
(which contain an internal bypass capacitor to ground).
Ceramic Resonator
External Clock Source
Figure 3-7
Figure 3-9 Connecting an External Clock Signal
Figure 3-8 Connecting a Ceramic Resonator
EXTAL XTAL
no external load capacitors should be used.
R
f
c
z
56F803 Technical Data, Rev. 16
Recommended Ceramic Resonator
Parameters:
R
f
c
External
z
= 8MHz (optimized for 8MHz)
XTAL
Clock
= 1 to 3 MΩ
56F803
Figure
EXTAL
V
SS
3-8, a typical ceramic resonator circuit is
Figure
3-9. The external clock
Freescale Semiconductor