MAC7100CVF datasheet(14/48 Pages) MOTOROLA

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MAC7100 Microcontroller Family Hardware Specifications

MOTOROLA

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

Electrical Characteristics

3.8

Clock and Reset Generator Electrical

Characteristics

This section describes the electrical characteristics for the oscillator, phase-locked loop, clock monitor and

reset generator.

3.8.1

Oscillator Characteristics

The MAC7100 Family features an internal low power loop controlled Pierce oscillator and a full swing Pierce

oscillator/external clock mode. The selection of loop controlled Pierce oscillator or full swing Pierce

oscillator/external clock depends on the level of the XCLKS signal at the rising edge of the RESET signal.

Before asserting the oscillator to the internal system clock distribution subsystem, the quality of the

oscillation is checked for each start from either power on, STOP or oscillator fail. tCQOUT specifies the

maximum time before switching to the internal self clock mode after POR or STOP if a proper oscillation is

not detected. The quality check also determines the minimum oscillator start-up time tUPOSC. The device also

features a clock monitor. A Clock Monitor Failure is asserted if the frequency of the incoming clock signal

is below the Clock Monitor Assert Frequency fCMFA.

Table 17. Oscillator Characteristics

Num C

Rating

Symbol

Min

Typ

Max

Unit

H1a C Crystal oscillator range (loop controlled Pierce)

fOSC

4.0

—

MHz

H1b C Crystal oscillator range (full swing Pierce) 1, 2

1 Depending on the crystal; a damping series resistor might be necessary

2 XCLKS negated during reset

fOSC

0.5

—

MHz

P Startup Current

IOSC

100

—

µA

C Oscillator start-up time (loop controlled Pierce)

tUPOSC

—TBD 3

3 fosc = 4 MHz, C = 22 pF.

50 4

4 Maximum value is for extreme cases using high Q, low frequency crystals

D Clock Quality check time-out

tCQOUT

0.45

—

2.5

P Clock Monitor Failure Assert Frequency

fCMFA

100

200

KHz

P External square wave input frequency 2

fEXT

0.5

—

MHz

D External square wave pulse width low

tEXTL

9.5

—

D External square wave pulse width high

tEXTH

9.5

—

D External square wave rise time

tEXTR

——

H10 D External square wave fall time

tEXTF

——

H11 D Input Capacitance (EXTAL, XTAL pins)

CIN

—7

—

H12 C EXTAL pin DC Operating Bias in loop controlled

mode

VDCBIAS

—TBD

—

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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