PIC16F1459-ESSQTP datasheet(266/418 Pages) MICROCHIP

Part #	PIC16F1459-ESSQTP

Description	14/20-Pin Flash, 8-Bit USB Microcontrollers with XLP Technology

PDF	418 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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266 / 418 page

PIC16(L)F1454/5/9

DS41639A-page 266

Preliminary

 2012 Microchip Technology Inc.

23.2

Clock Accuracy with

Asynchronous Operation

The factory calibrates the internal oscillator block out-

put (INTOSC). However, the INTOSC 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

value in the OSCTUNE register allows for fine resolution

changes to the system clock source. See Section 5.2.2

“Internal Clock Sources”

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 23.4.1

“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.

PIC16F1459-ESSQTP Datasheet(PDF) 266 Page - Microchip Technology