DSP56F803 Motorola Inc, DSP56F803 Datasheet - Page 24

• Manufacturer Part Number: DSP56F803
• Description: 16-bit Hybrid Controller
• Manufacturer: Motorola Inc

This is the value load capacitance that should be used when selecting a crystal and determining the actual
frequency of operation of the crystal oscillator circuit.
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
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
Figure 9
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.
24
Note: Motorola recommends only two terminal ceramic resonators vs. three terminal
resonators (which contain an internal bypass capacitor to ground).
no external load capacitors should be used.
Ceramic Resonator
External Clock Source
Figure 11. Connecting an External Clock Signal
Figure 10. Connecting a Ceramic Resonator
Figure 9. Connecting to a Crystal Oscillator
Freescale Semiconductor, Inc.
EXTAL XTAL
EXTAL XTAL
For More Information On This Product,
R
f
c
R
f
c
z
z
Go to: www.freescale.com
External
Recommended Ceramic Resonator
Parameters:
R
f
XTAL
Clock
c
Recommended External Crystal
Parameters:
R
f
c
z
= 8MHz (optimized for 8MHz)
z
= 8MHz (optimized for 8MHz)
= 1 to 3 M
= 1 to 3 M
56F803
Figure
EXTAL
V
10, a typical ceramic resonator circuit is shown.
SS
Figure
11. The external clock
56F803 Technical Data