| Part Numbert | Mfg | Packt | D/C | Descriptiont | Qty | Company/Contact |
|
PAL20X8AVC Datasheet Copyright ~ 1998 IDG Books Worldwide. The IDG Books Worldwide logo, ...For Durnmies, ...For Teachers, ...For Kids & Parents, Dummies 101, ...Simplified, _Strategies. _Secrets. ...Studio Secrets, 3-D Visual, Teach Yourself VISUALLY, Master VISUALLY, and all related marks, logos, characters, design, and trade dress are trademarks or registered trademarks under exclusive license to IDG Books Worldwide, Inc., from Intemational Data Group, Inc. All other trademarks are the property of their respective owners. ALL RIGHTS RESERVED. PAL20X8AVC Price
PAL20X8AVC on stock RECOVERING LOCK. The phase comparator out- put can also be set to high and low levels to restore normal operation when the oscillator stops or the prescaler functions incorrectly at high frequency. In the first condition (oscillator off) the prescaler sometimes oscillates, at high frequency. The loop reacts by reducing the varicap voltage in an attempt to reduce the frequency, thus worsening the situ- ation. This out-of-lock condition is signalled to the microprocessor (by the OL output) which can set the phase comparator output to low level, forcing the varicap voltage up and restarting the oscillator. The phase comparator output is forced low by setting bit 5 0f register 8. After about l ms this bit is automati- cally reset and the loop should lock again.
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||
