PIC16F688 Datasheet, PDF (32/174 Pages) Microchip Technology – 14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F688
REGISTER 3-2:
bit 7
bit 6-4
bit 3
bit 2
bit 1
bit 0
OSCCON – OSCILLATOR CONTROL REGISTER (ADDRESS: 8Fh)
U-0
R/W-1 R/W-1 R/W-0
R-1
R-0
R-0
—
IRCF2
IRCF1
IRCF0 OSTS⁽¹⁾
HTS
LTS
bit 7
Unimplemented: Read as ‘0’
IRCF<2:0>: Internal Oscillator Frequency Select bits
000 =
001 =
010 =
011 =
100 =
101 =
110 =
111 =
31 kHz
125 kHz
250 kHz
500 kHz
1 MHz
2 MHz
4 MHz
8 MHz
OSTS: Oscillator Start-up Time-out Status bit
1 = Device is running from the external system clock defined by FOSC<2:0>
0 = Device is running from the internal system clock (HFINTOSC or LFINTOSC)
HTS: HFINTOSC (High Frequency – 8 MHz to 125 kHz) Status bit
1 = HFINTOSC is stable
0 = HFINTOSC is not stable
LTS: LFINTOSC (Low Frequency – 31 kHz) Stable bit
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>
R/W-0
SCS
bit 0
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.
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
TABLE 3-2: SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES
Address Name
Bit 7
Bit 6 Bit 5
Bit 4
Bit 3
Bit 2 Bit 1
Bit 0
Value on:
POR, BOD
Value on
all other
Resets
0Ch
PIR1
EEIF ADIF RCIF C2IF C1IF OSFIF TXIF TMR1IF 0000 0000 0000 0000
8Ch
PIE1
EEIE ADIE RCIE C2IE C1IE OSFIE TXIE TMR1IE 0000 0000 0000 0000
8Fh
OSCCON
—
IRCF2 IRCF1 IRCF0 OSTS⁽²⁾ HTS
LTS
SCS -110 x000 -110 x000
90h
OSCTUNE
2007h⁽¹⁾ CONFIG
—
CPD
—
—
TUN4 TUN3 TUN2 TUN1 TUN0 ---0 0000 ---u uuuu
CP MCLRE PWRTE WDTE FOSC2 FOSC1 FOSC0
—
—
Legend:
Note 1:
2:
x = unknown, u = unchanged, — = unimplemented locations read as ‘0’. Shaded cells are not used by oscillators.
See Register 11-1 for operation of all Configuration Word bits.
See Register 3-2 for details.
DS41203B-page 30
Preliminary
 2004 Microchip Technology Inc.