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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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DVR21 Folha de dados(PDF) 84 Page - Microchip Technology |
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DVR21 Folha de dados(HTML) 84 Page - Microchip Technology |
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84 / 416 page  PIC24FJ256GA705 FAMILY DS30010118D-page 84 2016-2018 Microchip Technology Inc. 7.4.1 POR AND LONG OSCILLATOR START-UP TIMES The oscillator start-up circuitry and its associated delay timers are not linked to the device Reset delays that occur at power-up. Some crystal circuits (especially low- frequency crystals) will have a relatively long start-up time. Therefore, one or more of the following conditions is possible after SYSRST is released: • The oscillator circuit has not begun to oscillate. • The Oscillator Start-up Timer has not expired (if a crystal oscillator is used). • The PLL has not achieved a lock (if PLL is used). The device will not begin to execute code until a valid clock source has been released to the system. There- fore, the oscillator and PLL start-up delays must be considered when the Reset delay time must be known. 7.4.2 FAIL-SAFE CLOCK MONITOR (FSCM) AND DEVICE RESETS If the FSCM is enabled, it will begin to monitor the system clock source when SYSRST is released. If a valid clock source is not available at this time, the device will automatically switch to the FRC Oscillator and the user can switch to the desired crystal oscillator in the Trap Service Routine (TSR). |
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