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INTEDG bảng dữ liệu(PDF) 306 Page - Microchip Technology

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Giải thích chi tiết về linh kiện  64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology
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INTEDG bảng dữ liệu(HTML) 306 Page - Microchip Technology

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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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