30F4013 datasheet(147/228 Pages) MICROCHIP

147 / 228 page

 2010 Microchip Technology Inc.

DS70138G-page 147

dsPIC30F3014/4013

20.3

Oscillator Control Registers

The

oscillators

are

controlled

with

two

SFRs,

OSCCON and OSCTUN and one Configuration

Note:

The description of the OSCCON and

OSCTUN SFRs, as well as the FOSC

Configuration register provided in this

section

are

applicable

only

the

dsPIC30F3014

and

dsPIC30F4013

devices in the dsPIC30F product family.

OSCCON: OSCILLATOR CONTROL REGISTER

U-0

R-y

U-0

R/W-y

—COSC<2:0>

—NOSC<2:0>

bit 15

bit 8

R/W-0

R-0

U-0

R/W-0

U-0

R/W-0

POST<1:0>

LOCK

—CF

—

LPOSCEN

OSWEN

bit 7

bit 0

Legend:

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 Group Selection bits (read-only)

111

= PLL oscillator; PLL source selected by FPR<4:0> bits

011

= External oscillator; OSC1/OSC2 pins; external oscillator configuration selected by FPR<4:0>

bits

010

= LPRC internal low-power RC

001

= FRC internal fast RC

000

= LP crystal oscillator; SOSCI/SOSCO pins

Set to FOS<2:0> values on POR or BOR. Loaded with NOSC<2:0> at the completion of a successful

clock switch. Set to FRC value when FSCM detects a failure and switches clock to FRC.

bit 11

Unimplemented: Read as ‘0’

bit 10-8

NOSC<2:0>: New Oscillator Group Selection bits

111

= PLL Oscillator; PLL source selected by FPR<4:0> bits

011

= External oscillator; OSC1/OSC2 pins; external oscillator configuration selected by FPR<4:0>

bits

010

= LPRC internal low-power RC

001

= FRC internal fast RC

000

= LP crystal oscillator; SOSCI/SOSCO pins

Set to FOS<2:0> values on POR or BOR.

bit 7-6

POST<1:0>: Oscillator Postscaler Selection bits

= Oscillator postscaler divides clock by 64

= Oscillator postscaler divides clock by 16

= Oscillator postscaler divides clock by 4

= Oscillator postscaler does not alter clock

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