12F508 Microchip Technology, 12F508 Datasheet - Page 26

• Manufacturer Part Number: 12F508
• Description: Search -----> PIC12F508
• Manufacturer: Microchip Technology

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PIC12F508/509/16F505
4.6
The Oscillator Calibration (OSCCAL) register is used to
calibrate the internal precision 4 MHz oscillator. It
contains seven bits for calibration
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:
DS41236B-page 24
Note:
OSCCAL Register
bit 7-1
bit 0
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.
OSCCAL REGISTER (ADDRESS: 05h)
CAL<6:0>: Oscillator Calibration bits
0111111 = Maximum frequency
•
•
•
0000001
0000000 = Center frequency
1111111
•
•
•
1000000 = Minimum frequency
Unimplemented: Read as ‘0’
bit 7
Legend:
R = Readable bit
-n = Value at POR
R/W-1
CAL6
.
R/W-1
CAL5
R/W-1
CAL4
Preliminary
W = Writable bit
‘1’ = Bit is set
R/W-1
CAL3
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-1
CAL2
R/W-1
CAL1
© 2005 Microchip Technology Inc.
x = Bit is unknown
R/W-1
CAL0
R/W-0
—
bit 0