PIC24FJ16MC101_12 Datasheet, PDF (104/350 Pages) Microchip Technology – 16-bit Microcontrollers (up to 32 KB Flash and 2 KB SRAM)

PIC24FJ16MC101/102 AND PIC24FJ32MC101/102/104
REGISTER 8-1:
U-0
—
bit 15
OSCCON: OSCILLATOR CONTROL REGISTER⁽¹⁾
R-0
R-0
R-0
U-0
R/W-y
COSC<2:0>
—
R/W-y
NOSC<2:0>⁽²⁾
R/W-y
bit 8
R/W-0
R/W-0
R-0
U-0
R/C-0
CLKLOCK IOLOCK
LOCK
—
CF
bit 7
U-0
R/W-0
R/W-0
—
LPOSCEN OSWEN
bit 0
Legend:
R = Readable bit
-n = Value at POR
y = Value set from Configuration bits on POR
C = Clearable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
bit 14-12
bit 11
bit 10-8
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
Unimplemented: Read as ‘0’
COSC<2:0>: Current Oscillator Selection bits (read-only)
111 = Fast RC Oscillator (FRC) with Divide-by-n
110 = Fast RC Oscillator (FRC) with Divide-by-16
101 = Low-Power RC Oscillator (LPRC)
100 = Secondary Oscillator (SOSC)
011 = Primary Oscillator (MS, EC) with PLL
010 = Primary Oscillator (MS, HS, EC)
001 = Fast RC Oscillator (FRC) with Divide-by-n and with PLL (FRCPLL)
000 = Fast RC Oscillator (FRC)
Unimplemented: Read as ‘0’
NOSC<2:0>: New Oscillator Selection bits⁽²⁾
111 = Fast RC Oscillator (FRC) with Divide-by-n
110 = Fast RC Oscillator (FRC) with Divide-by-16
101 = Low-Power RC Oscillator (LPRC)
100 = Secondary Oscillator (SOSC)
011 = Primary Oscillator (MS, EC) with PLL
010 = Primary Oscillator (MS, HS, EC)
001 = Fast RC Oscillator (FRC) with Divide-by-n and PLL (FRCPLL)
000 = Fast RC Oscillator (FRC)
CLKLOCK: Clock Lock Enable bit
If clock switching is enabled and FSCM is disabled, (FOSC<FCKSM> = 0b01)
1 = Clock switching is disabled, system clock source is locked
0 = Clock switching is enabled, system clock source can be modified by clock switching
IOLOCK: Peripheral Pin Select Lock bit
1 = Peripherial pin select is locked, write to peripheral pin select registers not allowed
0 = Peripherial pin select is not locked, write to peripheral pin select registers allowed
LOCK: PLL Lock Status bit (read-only)
1 = Indicates that PLL is in lock, or PLL start-up timer is satisfied
0 = Indicates that PLL is out of lock, start-up timer is in progress or PLL is disabled
Unimplemented: Read as ‘0’
CF: Clock Fail Detect bit (read/clear by application)
1 = FSCM has detected clock failure
0 = FSCM has not detected clock failure
Unimplemented: Read as ‘0’
Note 1:
2:
Writes to this register require an unlock sequence. Refer to Section 6. “Oscillator” (DS39700) in the
“PIC24F Family Reference Manual” for details.
Direct clock switches between any primary oscillator mode with PLL and FRCPLL mode are not permitted.
This applies to clock switches in either direction. In these instances, the application must switch to FRC
mode as a transition clock source between the two PLL modes.
DS39997C-page 104
Preliminary
© 2011-2012 Microchip Technology Inc.