12F615 datasheet(31/168 Pages) MICROCHIP

31 / 168 page

Preliminary

DS41302A-page 29

PIC12F609/615/12HV609/615

3.4.1.1

OSCTUNE Register

The oscillator is factory calibrated but can be adjusted

in software by writing to the OSCTUNE register

(Register 3-1).

The default value of the OSCTUNE register is ‘0’. The

value is a 5-bit two’s complement number.

When the OSCTUNE register is modified, the frequency

will begin shifting to the new frequency. Code execution

continues during this shift. There is no indication that the

shift has occurred.

TABLE 3-2:

SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES

OSCTUNE: OSCILLATOR TUNING REGISTER

U-0

R/W-0

—

TUN4

TUN3

TUN2

TUN1

TUN0

bit 7

bit 0

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

bit 7-5

Unimplemented: Read as ‘0’

bit 4-0

TUN<4:0>: Frequency Tuning bits

01111

= Maximum frequency

01110

•

00001

00000

= Oscillator module is running at the calibrated frequency.

11111

•

10000

= Minimum frequency

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR, BOR

Value on

all other

Resets(1)

CONFIG(2)

IOSCFS

MCLRE

PWRTE

WDTE

FOSC2

FOSC1

FOSC0

—

OSCTUNE

—

TUN4

TUN3

TUN2

TUN1

TUN0

---0 0000

---u uuuu

Legend:

= unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by oscillators.

Note

Other (non Power-up) Resets include MCLR Reset and Watchdog Timer Reset during normal operation.

See Configuration Word register (Register 11-1) for operation of all register bits.

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