70592C Datasheet, PDF (130/314 Pages) Microchip Technology – High-Performance, 16-bit Microcontrollers

PIC24HJXXXGPX06A/X08A/X10A
REGISTER 9-1: OSCCON: OSCILLATOR CONTROL REGISTER^(1,3)
U-0
—
bit 15
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
U-0
CLKLOCK
—
bit 7
R-0
U-0
R/C-0
LOCK
—
CF
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 = Clear only 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 (XT, HS, EC) with PLL
010 = Primary oscillator (XT, HS, EC)
001 = Fast RC oscillator (FRC) with PLL
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 (XT, HS, EC) with PLL
010 = Primary oscillator (XT, HS, EC)
001 = Fast RC oscillator (FRC) with PLL
000 = Fast RC oscillator (FRC)
CLKLOCK: Clock Lock Enable bit
1 = If (FCKSM0 = 1), the clock and PLL configurations are locked
If (FCKSM0 = 0), the clock and PLL configurations may be modified
0 = Clock and PLL selections are not locked, configurations may be modified
Unimplemented: Read as ‘0’
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:
3:
Writes to this register require an unlock sequence. Refer to Section 7. “Oscillator” (DS70227) in the
“dsPIC33F/PIC24H 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.
This register is reset only on a Power-on Reset (POR).
DS70592C-page 130
© 2011 Microchip Technology Inc.