MEC1322 datasheet(399/456 Pages) MICROCHIP

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DS00001719D-page 399

MEC1322

Note 38-4

This time only applies if the external 32KHz clock input is available.

Note 38-5

SUSCLK is required to have an accuracy of +/- 100 ppm.

Note 38-6

The drift in frequency after frequency lock if the 32kHz clock is removed is determined by varying

temperature while voltage is held constant.

TABLE 38-4:

CLOCK TIMING PARAMETERS

Clock

Parameters

Symbol

MIN

TYP

MAX

Units

48 MHz Ring

Oscillator

Start-up accuracy (without 32 kHz

present)

fSU

MHz

Start-up delay from 0 MHz to Start-

up accuracy

tSU

µs

Operating Frequency (with 32 kHz

present after frequency lock to 48

MHz)

fOP

47.04

48.95

MHz

Adjustment Delay from Start-up

accuracy to Operating accuracy

(time to attain frequency lock - with

32 kHz present)

tADJ

0.03

(Note 38-4)

Operating Frequency (with 32 kHz

removed after frequency locked to

48 MHz)

fOP

43.2

(Note 38-6)

-52.8

(Note 38-6)

MHz

SUSCLK

Operating Frequency

32.768

kHz

Period

(Note 38-5)

30.52

(Note 38-5)µs

High Time

Low Time

Fall Time

Rise Time

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