PIC12F635/PIC16F636/639
When the OSCTUNE register is modified, the
HFINTOSC frequency will begin shifting to the new
frequency. Code execution continues during this shift.
There is no indication that the shift has occurred.
3.5.2.1
OSCTUNE Register
The HFINTOSC is factory calibrated but can be
adjusted in software by writing to the OSCTUNE
register (Register 3-2).
OSCTUNE does not affect the LFINTOSC frequency.
Operation of features that depend on the LFINTOSC
clock source frequency, such as the Power-up Timer
(PWRT), Watchdog Timer (WDT), Fail-Safe Clock
Monitor (FSCM) and peripherals, are not affected by the
change in frequency.
The default value of the OSCTUNE register is ‘0’. The
value is a 5-bit two’s complement number.
REGISTER 3-2:
OSCTUNE: OSCILLATOR TUNING REGISTER
U-0
—
U-0
—
U-0
—
R/W-0
TUN4
R/W-0
TUN3
R/W-0
TUN2
R/W-0
TUN1
R/W-0
TUN0
bit 7
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 7-5
bit 4-0
Unimplemented: Read as ‘0’
TUN<4:0>: Frequency Tuning bits
01111= Maximum frequency
01110=
•
•
•
00001=
00000= Oscillator module is running at the calibrated frequency.
11111=
•
•
•
10000= Minimum frequency
DS41232D-page 40
© 2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
