MC68HC08AZ32A Datasheet, PDF(294/312 Page) Motorola, Inc – HCMOS Microcontroller Unit

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MC68HC08AZ32A Datasheet, PDF (294/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit

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Electrical Specifications

20.9 CGM Operating Conditions

Characteristic

Symbol

Min

Typ

Max

Unit

Operating voltage

VDDA

VSSA

VDDâ0.3

â

VDD+0.3

V

VSS â0.3

â

VSS+0.3

V

Crystal reference frequency

fCGMRCLK

1

4.9152

8

MHz

Module crystal reference frequency(1)

fCGMXCLK

â

4.9152

â

MHz

Range nominal multiplier

fNOM

â

4.9152

â

MHz

VCO center-of-range frequency

fCGMVRS

4.9152

â

Note(2)

MHz

VCO operating frequency

fCGMVCLK

4.9152

â

32.0

1. Same frequency as fCGMRCLK.

2. fCGMVRS is a nominal value described and calculated as an example in Chapter 4 Clock Generator Module (CGM) for the

desired VCO operating frequency, fCGMVCLK.

20.10 CGM Component Information

Description

Symbol

Min

Typ

Max

Unit

Crystal load capacitance(1)

CL

â

â

â

â

Crystal fixed capacitance(1)

C1

â

2 x CL

â

â

Crystal tuning capacitance(1)

C2

â

2 x CL

â

â

Filter capacitor multiply factor

CFACT

â

0.0154

â

F/s V

Filter capacitor(2)

CF

â

CFACT x

(VDDA/fCGMXCLK)

â

â

Bypass capacitor(3)

CBYP

â

0.1 ÂµF

â

ÂµF

1. Consult crystal manufacturerâs data

2. See 4.4.3 External Filter Capacitor Pin (CGMXFC).

3. CBYP must provide low AC impedance from f = fCGMXCLK/100 to 100 x fCGMVCLK. So, series resistance must be consid-

ered.

MC68HC08AZ32A Data Sheet, Rev. 2

294

Freescale Semiconductor

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