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PIC18F-LF1XK50 Datasheet, PDF (22/420 Pages) Microchip Technology – 20-Pin USB Flash Microcontrollers
PIC18F/LF1XK50
2.6.1 OSCTUNE REGISTER
The HFINTOSC is factory calibrated, but can be
adjusted in software by writing to the TUN<5:0> bits of
the OSCTUNE register (Register 2-3).
The default value of the TUN<5:0> is ‘000000’. The
value is a 6-bit two’s complement number.
When the OSCTUNE register is modified, the
HFINTOSC frequency will begin shifting to the new
frequency. Code execution continues during this shift,
while giving no indication that the shift has occurred.
OSCTUNE does not affect the LFINTOSC frequency.
The operation of features that depend on the LFINTOSC
clock source frequency, such as the Power-up Timer
(PWRT), Watchdog Timer (WDT), Fail-Safe Clock Mon-
itor (FSCM) and peripherals, are not affected by the
change in frequency.
The OSCTUNE register also implements the INTSRC
and SPLLEN bits, which control certain features of the
internal oscillator block.
The INTSRC bit allows users to select which internal
oscillator provides the clock source when the 31 kHz
frequency option is selected. This is covered in greater
detail in Section 2.5.1 “LFINTOSC”.
The SPLLEN bit controls the operation of the frequency
multiplier. For more details about the function of the
SPLLEN bit see Section 2.9 “4x Phase Lock Loop
Frequency Multiplier”
REGISTER 2-3: OSCTUNE: OSCILLATOR TUNING REGISTER
R/W-0
INTSRC
bit 7
R/W-0
SPLLEN
R/W-0
TUN5
R/W-0
TUN4
R/W-0
TUN3
R/W-0
TUN2
R/W-0
TUN1
R/W-0
TUN0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6
bit 5-0
INTSRC: Internal Oscillator Low-Frequency Source Select bit
1 = 31.25 kHz device clock derived from 16 MHz HFINTOSC source (divide-by-512 enabled)
0 = 31 kHz device clock derived directly from LFINTOSC internal oscillator
SPLLEN: Software Controlled Frequency Multiplier PLL bit
1 = PLL enabled (for HFINTOSC 8 MHz only)
0 = PLL disabled
TUN<5:0>: Frequency Tuning bits
011111 = Maximum frequency
011110 =
•••
000001 =
000000 = Oscillator module is running at the factory calibrated frequency.
111111 =
•••
100000 = Minimum frequency
DS41350E-page 22
Preliminary
 2010 Microchip Technology Inc.