Datasheet

PIC12C5XX
DS40139E-page 18  1999 Microchip Technology Inc.
4.5 OSCCAL Register
The Oscillator Calibration (OSCCAL) register is used to
calibrate the internal 4 MHz oscillator. It contains four to
six bits for calibration. Increasing the cal value
increases the frequency. See Section 7.2.5 for more
information on the internal oscillator.
FIGURE 4-6: OSCCAL REGISTER (ADDRESS 05h) FOR PIC12C508 AND PIC12C509
FIGURE 4-7: OSCCAL REGISTER (ADDRESS 05h) FOR PIC12C508A/C509A/CR509A/12CE518/
12CE519
R/W-0 R/W-1 R/W-1 R/W-1 R/W-0 R/W-0 U-0 U-0
CAL3 CAL2 CAL1 CAL0
— — — — R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit7 bit0
bit 7-4: CAL<3:0>: Calibration
bit 3-0: Unimplemented: Read as ’0’
R/W-1 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0 U-0
CAL5 CAL4 CAL3 CAL2 CAL1 CAL0
— — R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit7 bit0
bit 7-2: CAL<5:0>: Calibration
bit 1-0: Unimplemented: Read as ’0’