MC68HC908AP16CFB datasheet(111/440 Pages) MOTOROLA

111 / 440 page

Clock Generator Module (CGM)

Functional Description

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

111

5. Select the VCO’s power-of-two range multiplier E, according to

this table:

6. Select a VCO linear range multiplier, L, where fNOM = 125kHz

7. Calculate and verify the adequacy of the VCO programmed

center-of-range frequency, fVRS. The center-of-range frequency is

the midpoint between the minimum and maximum frequencies

attainable by the PLL.

For proper operation,

8. Verify the choice of P, R, N, E, and L by comparing fVCLK to fVRS

and fVCLKDES. For proper operation, fVCLK must be within the

application’s tolerance of fVCLKDES, and fVRS must be as close as

possible to fVCLK.

NOTE:

Exceeding the recommended maximum bus frequency or VCO

frequency can crash the MCU.

Frequency Range

0 < fVCLK < 9,830,400

9,830,400

≤ f

VCLK < 19,660,800

19,660,800

≤ f

VCLK < 39,321,600

NOTE: Do not program E to a value of 3.

round

VCLK

NOM

--------------------------

⎝⎠

⎜⎟

⎛⎞

VRS

()f

NOM

VRS

VCLK

–

NOM

--------------------------

≤

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 111 Page - Motorola, Inc

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