PIC12F683-ISLASHP datasheet(79/148 Pages) MICROCHIP

79 / 148 page

 2004 Microchip Technology Inc.

Preliminary

DS41211B-page 77

PIC12F683

12.2

Calibration Bits

The Brown-out Detect (BOD), Power-on Reset (POR)

and 8 MHz internal oscillator (HFINTOSC) are factory

calibrated. These calibration values are stored in the

Calibration Word register, as shown in Register 12-2

and are mapped in program memory location 2008h.

The Calibration Word register is not erased when the

device is erased when using the procedure described

in the “PIC12F6XX/16F6XX Memory Programming

Specification” (DS41204). Therefore, it is not neces-

sary to store and reprogram these values when the

device is erased.

CALIB – CALIBRATION WORD (ADDRESS: 2008h)

Note:

Address 2008h is beyond the user program

memory space. It belongs to the special

configuration

memory

space

(2000h-

3FFFh), which can be accessed only during

programming. See “PIC12F6XX/16F6XX

Memory

Programming

Specification”

(DS41204) for more information.

—

FCAL6 FCAL5

FCAL4

FCAL3

FCAL2

FCAL1 FCAL0

—

POR1

POR0

BOD2

BOD1

BOD0

bit 13

bit 0

bit 13

Unimplemented: Read as ‘0’

bit 12-6

FCAL<6:0>: Internal Oscillator Calibration bits

0111111

= Maximum frequency

0000001

0000000

= Center frequency

1111111

1000000

= Minimum frequency

bit 5

Unimplemented: Read as ‘0’

bit 4-3

POR<1:0>: POR Calibration bits

= Lowest POR voltage

= Highest POR voltage

bit 2-0

BOD<2:0>: BOD Calibration bits

000

= Reserved

001

= Lowest BOD voltage

111

= Highest BOD voltage

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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