PIC12F508 View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'PIC12F508' PDF : 110 Pages View PDF
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
bit 7
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 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 7-1
bit 0
CAL<6:0>: Oscillator Calibration bits
0111111 = Maximum frequency
•
•
•
0000001
0000000 = Center frequency
1111111
•
•
•
1000000 = Minimum frequency
Unimplemented: Read as ‘0’
DS41236E-page 26
© 2009 Microchip Technology Inc.
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