PIC12F508-I/SL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC12F508-I/SL

8/14-Pin, 8-Bit Flash Microcontrollers

Microchip Technology 

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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