PIC16F688 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F688

14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F688

3.2 Oscillator Control

The Oscillator Control (OSCCON) register (Figure 3-1)

controls the system clock and frequency selection

options. The OSCCON register contains the following

bits:

• Frequency selection bits (IRCF)

• Frequency Status bits (HTS, LTS)

• System clock control bits (OSTS, SCS)

REGISTER 3-1: OSCCON: OSCILLATOR CONTROL REGISTER

U-0

—

bit 7

R/W-1

IRCF2

R/W-1

IRCF1

R/W-0

IRCF0

R-1

OSTS(1)

R-0

HTS

R-0

R/W-0

LTS

SCS

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

bit 6-4

bit 3

bit 2

bit 1

bit 0

Unimplemented: Read as ‘0’

IRCF<2:0>: Internal Oscillator Frequency Select bits

111 = 8 MHz

110 = 4 MHz (default)

101 = 2 MHz

100 = 1 MHz

011 = 500 kHz

010 = 250 kHz

001 = 125 kHz

000 = 31 kHz (LFINTOSC)

OSTS: Oscillator Start-up Time-out Status bit(1)

1 = Device is running from the external clock defined by FOSC<2:0> of the Configuration Word

0 = Device is running from the internal oscillator (HFINTOSC or LFINTOSC)

HTS: HFINTOSC Status bit (High Frequency – 8 MHz to 125 kHz)

1 = HFINTOSC is stable

0 = HFINTOSC is not stable

LTS: LFINTOSC Stable bit (Low Frequency – 31 kHz)

1 = LFINTOSC is stable

0 = LFINTOSC is not stable

SCS: System Clock Select bit

1 = Internal oscillator is used for system clock

0 = Clock source defined by FOSC<2:0> of the Configuration Word

Note 1: Bit resets to ‘0’ with Two-Speed Start-up and LP, XT or HS selected as the Oscillator mode or Fail-Safe

mode is enabled.

DS41203D-page 22

© 2007 Microchip Technology Inc.

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