PIC16F753 datasheet(38/230 Pages) MICROCHIP

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PIC16F753/HV753

DS40001709C-page 38

 2013-2015 Microchip Technology Inc.

4.5.1

OSCTUNE REGISTER

The oscillator is factory calibrated, but can be adjusted

in software by writing to the OSCTUNE register

(Register 4-2).

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 4-2:

SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES

TABLE 4-3:

SUMMARY OF CONFIGURATION WORD CLOCK SOURCES

OSCTUNE: OSCILLATOR TUNING REGISTER

U-0

R/W-0/u

—

TUN<4:0>

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

on Page

OSCCON

—

IRCF<1:0>

—HTS

LTS

—

OSCTUNE

—

TUN<4:0>

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

oscillators.

Name

Bits

Bit -/7

Bit -/6

Bit 13/5

Bit 12/4

Bit 11/3

Bit 10/2

Bit 9/1

Bit 8/0

on Page

CONFIG(1)

13:8

—

DEBUG

CLKOUTEN

WRT<1:0>

BOREN<1:0>

150

7:0

—

MCLRE

PWRTE

WDTE

—

—FOSC0

Legend:

— = unimplemented location, read as ‘1’. Shaded cells are not used by oscillator module.

Note

See Configuration Word register (Register 19-1) for operation of all register bits.

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