DSP56852PB View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56852PB

16-bit Digital Signal Processor

Motorola => Freescale 

Freescale Semiconductor, Inc.

External Clock Operation

Crystal Frequency = 2–4MHz (optimized for 4MHz)

EXTAL XTAL

Rz

Sample External Crystal Parameters:

Rz = 10MΩ

TOD_SEL bit in CGM may be set to 0 or

1. 0 is recommended.

Figure 8. Crystal Oscillator

4.5.2 High Speed External Clock Source (> 4MHz)

The recommended method of connecting an external clock is given in Figure 9. The external clock source

is connected to XTAL and the EXTAL pin is held at ground (recommended), VDDA, or VDDA/2. The

TOD_SEL bit in CGM must be set to 1.

DSP56852

XTAL EXTAL

External GND,VDDA,

Clock

(up to 240MHz)

or VDDA/2

Figure 9. Connecting a High Speed External Clock Signal using XTAL

4.5.3 Low Speed External Clock Source (2-4MHz)

The recommended method of connecting an external clock is given in Figure 10. The external clock

source is connected to XTAL and the EXTAL pin is held at VDDA/2. The TOD_SEL bit in CGM may be

set to 0 or 1. 0 is recommended.

DSP56852

XTAL EXTAL

External

Clock

(2-4MHz)

VDDA/2

Figure 10. Connecting a Low Speed External Clock Signal using XTAL

DSP56852 Technical Data

19

Preliminary

For More Information On This Product,

Go to: www.freescale.com

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