PIC18F1XK22 Datasheet, PDF (16/388 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC18F1XK22/LF1XK22
FIGURE 2-1:
PIC^® MCU CLOCK SOURCE BLOCK DIAGRAM
OSC1/T13CKI
Primary
Oscillator,
External
and
Secondary
Oscillator
Timer1/Timer3
OSC2
Sleep
PCLKEN
PRI_SD
T1OSCEN
Internal
Oscillator
Block
16 MHz
HFINTOSC
31 kHz
LFINTOSC
PIC18F1XK22/LF1XK22
4 x PLL
FOSC<3:0>
PLL_EN
PLLEN
IRCF<2:0>
16 MHz
8 MHz
110
4 MHz
2 MHz ¹⁰¹
1 MHz ¹⁰⁰
011
500 kHz
010
250 kHz
001
1 31 kHz ₀₀₀
0
INTSRC
LP, XT, HS, RC, EC,
1 Secondary Osc.
0x
0
IDLEN
Sleep
Internal Osc.
1x
System
Clock
Sleep
Peripherals
CPU
FOSC<3:0>
Clock
Control SCS<1:0>
Watchdog
Timer
Fail-Safe
Clock
Two-Speed
Start-up
Note:
If using a low-frequency external oscillator
and want to multiple it by 4 via PLL, the
ideal input frequency is from 4 MHz to 16
MHz.
DS41365D-page 16
Preliminary
 2010 Microchip Technology Inc.