Datasheet

 2012 Microchip Technology Inc. Preliminary DS41639A-page 65
PIC16(L)F1454/5/9
FIGURE 5-7: INTERNAL OSCILLATOR SWITCH TIMING
HFINTOSC
LFINTOSC
IRCF <3:0>
System Clock
HFINTOSC
LFINTOSC
IRCF <3:0>
System Clock
0 0
0 0
Start-up Time
2-cycle Sync Running
2-cycle Sync Running
HFINTOSC LFINTOSC (FSCM and WDT disabled)
HFINTOSC LFINTOSC (Either FSCM or WDT enabled)
LFINTOSC
HFINTOSC
IRCF <3:0>
System Clock
= 0  0
Start-up Time 2-cycle Sync
Running
LFINTOSC HFINTOSC
LFINTOSC turns off unless WDT or FSCM is enabled