PIC16LF1503 Datasheet, PDF (45/340 Pages) Microchip Technology – 14-Pin Flash, 8-Bit Microcontrollers

PIC16(L)F1503
5.0 OSCILLATOR MODULE
5.1 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 perfor-
mance and minimizing power consumption. Figure 5-1
illustrates a block diagram of the oscillator module.
The oscillator module can be configured in one of the
following clock modes.
1. ECL – External Clock Low-Power mode
(0 MHz to 0.5 MHz)
2. ECM – External Clock Medium-Power mode
(0.5 MHz to 4 MHz)
3. ECH – External Clock High-Power mode
(4 MHz to 20 MHz)
4. INTOSC – Internal oscillator (31 kHz to 16 MHz).
Clock Source modes are selected by the FOSC<1:0>
bits in the Configuration Words. The FOSC bits
determine the type of oscillator that will be used when
the device is first powered.
The EC clock mode relies on an external logic level
signal as the device clock source.
The INTOSC internal oscillator block produces low and
high frequency clock sources, designated LFINTOSC
and HFINTOSC. (see Internal Oscillator Block,
Figure 5-1). A wide selection of device clock
frequencies may be derived from these clock sources.
FIGURE 5-1:
SIMPLIFIED PIC^® MCU CLOCK SOURCE BLOCK DIAGRAM
CLKIN
CLKIN EC
Internal
Oscillator
Block
16 MHz
Source
16 MHz
(HFINTOSC)
31 kHz
Source
IRCF<3:0>
16 MHz
8 MHz
4 MHz
2 MHz
1 MHz
500 kHz
250 kHz
125 kHz
62.5 kHz
31.25 kHz
31 kHz
31 kHz (LFINTOSC)
EC
Internal Oscillator
Sleep
CPU and
Peripherals
Clock
Control
FOSC<1:0> SCS<1:0>
WDT, PWRT and other modules
 2011 Microchip Technology Inc.
Preliminary
DS41607A-page 45