OPTION_REG datasheet(81/222 Pages) MICROCHIP

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 2013 Microchip Technology Inc.

DS22331A-page 81

MCP19111

13.0

OSCILLATOR MODES

The MCP19111 has one oscillator configuration which

is an 8 MHz internal oscillator.

13.1

Internal Oscillator (INTOSC)

The Internal Oscillator module provides a system

clock source of 8 MHz. The frequency of the internal

oscillator can be trimmed with a calibration value in the

OSCTUNE register.

13.2

Oscillator Calibration

The 8 MHz internal oscillator is factory calibrated. The

factory calibration values reside in the read-only

Calibration Word 1 register. These values must be read

from the Calibration Word 1 register and stored in the

OSCCAL register. Refer to Section 18.0 “Flash

Program Memory Control” for the procedure on

reading from program memory.

13.3

Frequency Tuning in User Mode

In addition to the factory calibration, the base

frequency can be tuned in the user's application. This

frequency tuning capability allows the user to deviate

from the factory calibrated frequency. The user can

tune the frequency by writing to the OSCTUNE

Note 1: The FCAL<6:0> bits from the Calibration

Word 1 register must be written into the

OSCCAL register to calibrate the internal

oscillator.

OSCTUNE – OSCILLATOR TUNING REGISTER

U-0

R/W-0

—

TUN4

TUN3

TUN2

TUN1

TUN0

bit 7

bit 0

Legend:

R = Readable bit

P = Programmable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-5

Unimplemented: Read as ‘0’

bit 4-0

TUN<4:0>: Frequency Tuning bits

01111

= Maximum frequency

01110

•

00001

00000

= Center frequency. Oscillator Module is running at the calibrated frequency.

11111

•

10000

= Minimum frequency

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