The 2 registers of OSC (Oscillator and clocks), from 0xBF80F000, with their reset value and every field. The PIC32MX795F512L has 789 registers in 67 peripherals, one page each.
Most PIC32 SFRs have three more registers right after them: CLR at +4, SET at +8 and INV at +C (T1CONCLR, T1CONSET, T1CONINV), which clear, set or flip just the bits written as 1, in one write.
OSC Oscillator and clocks
OSCCONOscillator Control Register
Address
0xBF80F000
Reset
0x00000000
Access
read/write
Size
32-bit
15 fields
Field
Bits
What it does
PLLODIV
29:27
Output Divider for PLL
0 PLL output divided by 1
1 PLL output divided by 2
2 PLL output divided by 4
3 PLL output divided by 8
4 PLL output divided by 16
5 PLL output divided by 32
6 PLL output divided by 64
7 PLL output divided by 256
FRCDIV
26:24
Internal Fast RC Oscillator Clock Divider bits
0 FRC divided by 1
1 FRC divided by 2 (default setting)
2 FRC divided by 4
3 FRC divided by 8
4 FRC divided by 16
5 FRC divided by 32
6 FRC divided by 64
7 FRC divided by 256
SOSCRDY
22
Secondary Oscillator (SOSC) Ready Indicator bit
0 Secondary Oscillator is still warming up or is turned off
1 Indicates that the Secondary Oscillator is running and is stable
PBDIV
20:19
Peripheral Bus Clock (PBCLK) Divisor bits
0 PBCLK is SYSCLK divided by 1
1 PBCLK is SYSCLK divided by 2
2 PBCLK is SYSCLK divided by 4
3 PBCLK is SYSCLK divided by 8 (default)
PLLMULT
18:16
Phase-Locked Loop (PLL) Multiplier bits
0 Clock is multiplied by 15
1 Clock is multiplied by 16
2 Clock is multiplied by 17
3 Clock is multiplied by 18
4 Clock is multiplied by 19
5 Clock is multiplied by 20
6 Clock is multiplied by 21
7 Clock is multiplied by 24
COSC
14:12
Current Oscillator Selection bits
0 Internal Fast RC (FRC) Oscillator
1 Internal Fast RC Oscillator with PLL module via Postscaler (FRCPLL)
2 Primary Oscillator (POSC) (XT/HS/EC)
3 Primary Oscillator (POSC) with PLL module (XTPLL/HSPLL/ECPLL)
4 Secondary Oscillator (SOSC)
5 Internal Low-Power RC (LPRC) Oscillator
6 Internal Fast RC (FRC) Oscillator divided by 16
7 Internal Fast RC (FRC) Oscillator divided by OSCCON(FRCDIV) bits
NOSC
10:8
New Oscillator Selection bits
0 Internal Fast Internal RC Oscillator (FRC)
1 Internal Fast Internal RC Oscillator with PLL module via Postscaler (FRCPLL)
2 Primary Oscillator (XT/HS/EC)
3 Primary Oscillator with PLL module (XTPLL/HSPLL/ECPLL)
4 Secondary Oscillator (SOSC)
5 Internal Low-Power RC (LPRC) Oscillator
6 Internal Fast RC Oscillator (FRC) divided by 16
7 Internal Fast RC Oscillator (FRC) divided by OSCCON(FRCDIV) bits
CLKLOCK
7
Clock Selection Lock Enable bit
0 (If FCKSM(1:0) is 1x) Clock and PLL selections are not locked and may be modified / (If FCKSM(1:0) is 0x) Clock and PLL selections are never locked and may be modified
1 (If FCKSM(1:0) is 1x) Clock and PLL selections are locked / (If FCKSM(1:0) is 0x) Clock and PLL selections are never locked and may be modified
ULOCK
6
USB PLL Lock Status bit
0 Indicates that the USB PLL module is out of lock or USB PLL module start-up timer is in progress or USB PLL is disabled
1 Indicates that the USB PLL module is in lock or USB PLL module start-up timer is satisfied
SLOCK
5
PLL Lock Status bit
0 PLL module is out of lock
1 PLL module is in lock or PLL module start-up timer is satisfied
SLPEN
4
Sleep Mode Enable bit
0 Device will enter Idle mode when a WAIT instruction is executed
1 Device will enter Sleep mode when a WAIT instruction is executed
CF
3
Clock Fail Detect bit
0 No clock failure has been detected
1 FSCM has detected a clock failure
UFRCEN
2
USB FRC Clock Enable bit
0 Use the Primary Oscillator or USB PLL as the USB clock source
1 Enable FRC as the clock source for the USB clock source
SOSCEN
1
Secondary Oscillator Enable bit
0 Disable Secondary Oscillator
1 Enable Secondary Oscillator
OSWEN
0
Oscillator Switch Enable bit
0 Oscillator switch is complete
1 Initiate an oscillator switch to selection specified by NOSC(2:0) bits
OSCTUNFRC Tuning Register
Address
0xBF80F010
Reset
0x00000000
Access
read/write
Size
32-bit
1 field
Field
Bits
What it does
TUN
5:0
FRC Oscillator Tuning bits
0 Center frequency. Oscillator runs at minimal frequency (8 MHz)
BETA