PIC24F32KA302-ISLASHML datasheet(117/364 Pages) MICROCHIP

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 2011-2013 Microchip Technology Inc.

DS39995D-page 117

PIC24FV32KA304 FAMILY

9.3

Control Registers

The operation of the oscillator is controlled by three

Special Function Registers (SFRs):

• OSCCON

•CLKDIV

•OSCTUN

The OSCCON register (Register 9-1) is the main

control register for the oscillator. It controls clock

source switching and allows the monitoring of clock

sources.

The Clock Divider register (Register 9-2) controls the

features associated with Doze mode, as well as the

postscaler for the FRC oscillator.

The FRC Oscillator Tune register (Register 9-3) allows

the user to fine tune the FRC oscillator over a range of

approximately ±5.25%. Each bit increment or decre-

ment changes the factory calibrated frequency of the

FRC oscillator by a fixed amount.

OSCCON: OSCILLATOR CONTROL REGISTER

U-0

R-0, HSC

U-0

R/W-x(1)

—

COSC2

COSC1

COSC0

—

NOSC2

NOSC1

NOSC0

bit 15

bit 8

R/SO-0, HSC

U-0

R-0, HSC(2)

U-0

R/CO-0, HS

R/W-0(3)

R/W-0

CLKLOCK

—LOCK

—

SOSCDRV

SOSCEN

OSWEN

bit 7

bit 0

Legend:

HSC = Hardware Settable/Clearable bit

HS = Hardware Settable bit

CO = Clearable Only bit

SO = Settable Only bit

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15

Unimplemented: Read as ‘0’

bit 14-12

COSC<2:0>: Current Oscillator Selection bits

111 = 8 MHz Fast RC Oscillator with Postscaler (FRCDIV)

110 = 500 kHz Low-Power Fast RC Oscillator (FRC) with Postscaler (LPFRCDIV)

101 = Low-Power RC Oscillator (LPRC)

100 = Secondary Oscillator (SOSC)

011 = Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL)

010 = Primary Oscillator (XT, HS, EC)

001 = 8 MHz FRC Oscillator with Postscaler and PLL module (FRCPLL)

000 = 8 MHz FRC Oscillator (FRC)

bit 11

Unimplemented: Read as ‘0’

bit 10-8

NOSC<2:0>: New Oscillator Selection bits(1)

111 = 8 MHz Fast RC Oscillator with Postscaler (FRCDIV)

110 = 500 kHz Low-Power Fast RC Oscillator (FRC) with Postscaler (LPFRCDIV)

101 = Low-Power RC Oscillator (LPRC)

100 = Secondary Oscillator (SOSC)

011 = Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL)

010 = Primary Oscillator (XT, HS, EC)

001 = 8 MHz FRC Oscillator with Postscaler and PLL module (FRCPLL)

000 = 8 MHz FRC Oscillator (FRC)

Note 1:

Reset values for these bits are determined by the FNOSCx Configuration bits.

This bit also resets to ‘0’ during any valid clock switch or whenever a non-PLL Clock mode is selected.

When SOSC is selected to run from a digital clock input, rather than an external crystal (SOSCSRC = 0),

this bit has no effect.

PIC24F32KA302-I/ML Datasheet(PDF) 117 Page - Microchip Technology

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