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INTEDG Folha de dados(PDF) 306 Page - Microchip Technology |
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INTEDG Folha de dados(HTML) 306 Page - Microchip Technology |
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306 / 478 page ![]() PIC16(L)F1946/47 DS41414D-page 306 2010-2012 Microchip Technology Inc. 25.2 Clock Accuracy with Asynchronous Operation The factory calibrates the internal oscillator block output (HFINTOSC). However, the HFINTOSC frequency may drift as VDD or temperature changes, and this directly affects the asynchronous baud rate. Two methods may be used to adjust the baud rate clock, but both require a reference clock source of some kind. The first (preferred) method uses the OSCTUNE register to adjust the HFINTOSC output. Adjusting the value in the OSCTUNE register allows for fine resolution changes to the system clock source. See Section 5.2 “Clock Source Types” for more information. The other method adjusts the value in the Baud Rate Generator. This can be done automatically with the Auto-Baud Detect feature (see Section 25.4.1 “Auto-Baud Detect” ). There may not be fine enough resolution when adjusting the Baud Rate Generator to compensate for a gradual change in the peripheral clock frequency. |
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