PIC16LF720_11 Datasheet, PDF (67/244 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC16(L)F720/721
7.0 OSCILLATOR MODULE
7.1 Overview
The oscillator module has a wide variety of clock sources
and selection features that allow it to be used in a wide
range of applications while maximizing performance and
minimizing power consumption. Figure 7-1 illustrates a
block diagram of the oscillator module.
Clock sources can be configured from external
oscillators, quartz crystal resonators, ceramic resonators
and Resistor-Capacitor (RC) circuits. In addition, the
system can be configured to use an internal calibrated
high-frequency oscillator as clock source, with a choice
of selectable speeds via software.
Clock source modes are configured by the FOSC bits
in Configuration Word 1 (CONFIG1). The oscillator
module can be configured for one of eight modes of
operation.
1. EC – CLKOUT function on RA4/CLKOUT pin,
CLKIN on RA5/CLKIN.
2. EC – I/O function on RA4/CLKOUT pin, CLKIN
on RA5/CLKIN.
3. INTOSC – CLKOUT function on RA4/CLKOUT
pin, I/O function on RA5/CLKIN
4. INTOSCIO – I/O function on RA4/CLKOUT pin,
I/O function on RA5/CLKIN
FIGURE 7-1:
SIMPLIFIED PIC^® MCU CLOCK SOURCE BLOCK DIAGRAM
FOSC<2:0>
(Configuration Word 1)
CLKIN
Internal Oscillator
500 kHz
MFINTOSC
0
32x
1
PLL
IRCF<1:0>
(OSCCON Register)
16 MHz/500 kHz
11
8 MHz/250 kHz ₁₀
4 MHz/125 kHz
01
2 MHz/62.5 kHz
00
EC
INTOSC
System Clock
(CPU and Peripherals)
PLLEN
(Configuration Word 1)
 2011 Microchip Technology Inc.
Preliminary
DS41430B-page 67