PIC16F688 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F688

14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F688

3.5.2.1 OSCTUNE Register

The HFINTOSC is factory calibrated but can be

adjusted in software by writing to the OSCTUNE

register (Register 3-2).

The default value of the OSCTUNE register is ‘0’. The

value is a 5-bit two’s complement number.

When the OSCTUNE register is modified, the

HFINTOSC frequency will begin shifting to the new

frequency. Code execution continues during this shift.

There is no indication that the shift has occurred.

OSCTUNE does not affect the LFINTOSC frequency.

Operation of features that depend on the LFINTOSC

clock source frequency, such as the Power-up Timer

(PWRT), Watchdog Timer (WDT), Fail-Safe Clock

Monitor (FSCM) and peripherals, are not affected by the

change in frequency.

REGISTER 3-2: OSCTUNE: OSCILLATOR TUNING REGISTER

U-0

—

bit 7

U-0

U-0

R/W-0

R/W-0

R/W-0

—

—

TUN4

TUN3

TUN2

R/W-0

TUN1

R/W-0

TUN0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-5

bit 4-0

Unimplemented: Read as ‘0’

TUN<4:0>: Frequency Tuning bits

01111 = Maximum frequency

01110 =

•

•

•

00001 =

00000 = Oscillator module is running at the calibrated frequency.

11111 =

•

•

•

10000 = Minimum frequency

DS41203D-page 26

© 2007 Microchip Technology Inc.

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