Datasheet

 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
register, FOSC.
Note: The description of the OSCCON and
OSCTUN SFRs, as well as the FOSC
Configuration register provided in this
section are applicable only to the
dsPIC30F3014 and dsPIC30F4013
devices in the dsPIC30F product family.
REGISTER 20-1: OSCCON: OSCILLATOR CONTROL REGISTER
U-0 R-y R-y R-y U-0 R/W-y R/W-y R/W-y
—COSC<2:0>—NOSC<2:0>
bit 15 bit 8
R/W-0 R/W-0 R-0 U-0 R/W-0 U-0 R/W-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
11 = Oscillator postscaler divides clock by 64
10 = Oscillator postscaler divides clock by 16
01 = Oscillator postscaler divides clock by 4
00 = Oscillator postscaler does not alter clock