PIC12F508/509/16F505
4.6
OSCCAL Register
The Oscillator Calibration (OSCCAL) register is used to
calibrate the internal precision 4 MHz oscillator. It
contains seven bits for calibration.
Note:
Erasing the device will also erase the pre-
programmed internal calibration value for
the internal oscillator. The calibration
value must be read prior to erasing the
part so it can be reprogrammed correctly
later.
After you move in the calibration constant, do not
change the value. See Section 7.2.5 “Internal 4 MHz
RC Oscillator”.
REGISTER 4-5:
OSCCAL REGISTER (ADDRESS: 05h)
R/W-1
CAL6
R/W-1
CAL5
R/W-1
CAL4
R/W-1
CAL3
R/W-1
CAL2
R/W-1
CAL1
R/W-1
CAL0
R/W-0
—
bit 7
bit 0
bit 7-1
CAL<6:0>: Oscillator Calibration bits
0111111= Maximum frequency
•
•
•
0000001
0000000= Center frequency
1111111
•
•
•
1000000= Minimum frequency
bit 0
Unimplemented: Read as ‘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
DS41236C-page 24
Preliminary
© 2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
