PIC16F631 Datasheet, PDF (56/294 Pages) Microchip Technology – 20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F631/677/685/687/689/690
FIGURE 3-6:
INTERNAL OSCILLATOR SWITCH TIMING
HFINTOSC LFINTOSC (FSCM and WDT disabled)
HFINTOSC
LFINTOSC
Start-up Time
2-cycle Sync
IRCF <2:0>
≠0
=0
System Clock
Running
HFINTOSC LFINTOSC (Either FSCM or WDT enabled)
HFINTOSC
LFINTOSC
IRCF <2:0>
2-cycle Sync
≠0
=0
System Clock
Running
LFINTOSC HFINTOSC
LFINTOSC
HFINTOSC
Start-up Time 2-cycle Sync
IRCF <2:0>
=0
¼0
System Clock
LFINTOSC turns off unless WDT or FSCM is enabled
Running
DS41262D-page 54
© 2007 Microchip Technology Inc.