PIC16F636-I Datasheet, PDF (44/234 Pages) Microchip Technology – 8/14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC12F635/PIC16F636/639
FIGURE 3-6:
INTERNAL OSCILLATOR SWITCH TIMING
HF LF⁽¹⁾
HFINTOSC LFINTOSC (FSCM and WDT disabled)
HFINTOSC
LFINTOSC
Start-up Time
2-cycle Sync
IRCF <2:0>
≠0
=0
System Clock
Note 1: When going from LF to HF.
HFINTOSC LFINTOSC (Either FSCM or WDT enabled)
HFINTOSC
LFINTOSC
IRCF <2:0>
2-cycle Sync
≠0
=0
System Clock
Running
Running
LFINTOSC HFINTOSC
LFINTOSC
HFINTOSC
Start-up Time 2-cycle Sync
IRCF <2:0>
=0
≠0
System Clock
LFINTOSC turns off unless WDT or FSCM is enabled
Running
DS41232D-page 42
© 2007 Microchip Technology Inc.