pic24hj128gp510at-i-pt Microchip Technology Inc., pic24hj128gp510at-i-pt Datasheet - Page 130

• Manufacturer Part Number: pic24hj128gp510at-i-pt
• Description: High-performance, 16-bit Microcontrollers
• Manufacturer: Microchip Technology Inc.

PIC24HJXXXGPX06A/X08A/X10A
REGISTER 9-1:
DS70592A-page 128
bit 15
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 15
bit 14-12
bit 11
bit 10-8
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
CLKLOCK
Note 1: Writes to this register require an unlock sequence. Refer to Section 7. “Oscillator” (DS70227) in the
R/W-0
U-0
—
2: Direct clock switches between any primary oscillator mode with PLL and FRCPLL mode are not permitted.
“PIC24H Family Reference Manual” (available from the Microchip website) for details.
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.
Unimplemented: Read as ‘0’
COSC<2:0>: Current Oscillator Selection bits (read-only)
000 = Fast RC oscillator (FRC)
001 = Fast RC oscillator (FRC) with PLL
010 = Primary oscillator (XT, HS, EC)
011 = Primary oscillator (XT, HS, EC) with PLL
100 = Secondary oscillator (SOSC)
101 = Low-Power RC oscillator (LPRC)
110 = Fast RC oscillator (FRC) with Divide-by-16
111 = Fast RC oscillator (FRC) with Divide-by-n
Unimplemented: Read as ‘0’
NOSC<2:0>: New Oscillator Selection bits
000 = Fast RC oscillator (FRC)
001 = Fast RC oscillator (FRC) with PLL
010 = Primary oscillator (XT, HS, EC)
011 = Primary oscillator (XT, HS, EC) with PLL
100 = Secondary oscillator (SOSC)
101 = Low-Power RC oscillator (LPRC)
110 = Fast RC oscillator (FRC) with Divide-by-16
111 = Fast RC oscillator (FRC) with Divide-by-n
CLKLOCK: Clock Lock Enable bit
1 = If (FCKSM0 = 1), then clock and PLL configurations are locked
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’
If (FCKSM0 = 0), then clock and PLL configurations may be modified
R-0
U-0
—
OSCCON: OSCILLATOR CONTROL REGISTER
y = Value set from Configuration bits on POR
W = Writable bit
‘1’ = Bit is set
COSC<2:0>
LOCK
R-0
R-0
R-0
U-0
Preliminary
—
(2)
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/C-0
U-0
CF
—
R/W-y
(1)
U-0
—
© 2009 Microchip Technology Inc.
NOSC<2:0>
x = Bit is unknown
C = Clear only bit
LPOSCEN
R/W-y
R/W-0
(2)
OSWEN
R/W-0
R/W-y
bit 8
bit 0