PIC16F688

Manufacturer Part NumberPIC16F688
ManufacturerMicrochip Technology Inc.
PIC16F688 datasheet
 
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Page 24/202:

Oscillator Control

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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
R/W-1
R/W-1
IRCF2
IRCF1
bit 7
Legend:
R = Readable bit
W = Writable bit
-n = Value at POR
‘1’ = Bit is set
bit 7
Unimplemented: Read as ‘0’
bit 6-4
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)
bit 3
OSTS: Oscillator Start-up Time-out Status bit
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)
bit 2
HTS: HFINTOSC Status bit (High Frequency – 8 MHz to 125 kHz)
1 = HFINTOSC is stable
0 = HFINTOSC is not stable
bit 1
LTS: LFINTOSC Stable bit (Low Frequency – 31 kHz)
1 = LFINTOSC is stable
0 = LFINTOSC is not stable
bit 0
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
R/W-0
R-1
R-0
(1)
IRCF0
OSTS
HTS
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
(1)
R-0
R/W-0
LTS
SCS
bit 0
x = Bit is unknown
© 2007 Microchip Technology Inc.