PIC16F639 Microchip Technology Inc., PIC16F639 Datasheet - Page 44

• Manufacturer Part Number: PIC16F639
• Description: 8/14-pin Flash-based, 8-bit Cmos Microcontrollers With Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

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