PIC16F684T-I Datasheet, PDF (32/192 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F684
FIGURE 3-9:
FSCM TIMING DIAGRAM
Sample Clock
System
Clock
Output
Clock Monitor Output
(Q)
OSCFIF
Oscillator
Failure
Failure
Detected
Note:
Test
Test
Test
The system clock is normally at a much higher frequency than the sample clock. The relative frequencies in
this example have been chosen for clarity.
TABLE 3-2: SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES
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⁾
CPD
CP MCLRE PWRTE WDTE FOSC2 FOSC1 FOSC0
—
—
OSCCON
—
IRCF2 IRCF1 IRCF0 OSTS HTS
LTS
SCS -110 x000 -110 x000
OSCTUNE
—
—
—
TUN4 TUN3 TUN2 TUN1 TUN0 ---0 0000 ---u uuuu
PIE1
EEIE ADIE CCP1IE C2IE
C1IE OSFIE TMR2IE TMR1IE 0000 0000 0000 0000
PIR1
EEIF
ADIF CCP1IF C2IF
C1IF OSFIF TMR2IF TMR1IF 0000 0000 0000 0000
Legend:
Note 1:
2:
x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by oscillators.
Other (non Power-up) Resets include MCLR Reset and Watchdog Timer Reset during normal operation.
See Configuration Word register (Register 12-1) for operation of all register bits.
DS41202F-page 30
© 2007 Microchip Technology Inc.