PIC12F1516 MICROCHIP [Microchip Technology], PIC12F1516 Datasheet - Page 51

• Manufacturer Part Number: PIC12F1516
• Description: 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

5.0
5.1
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.
illustrates a block diagram of the oscillator module.
Clock sources can be supplied from external oscillators,
quartz crystal resonators, ceramic resonators and
Resistor-Capacitor (RC) circuits. In addition, the system
clock source can be supplied from one of two internal
oscillators, with a choice of speeds selectable via
software. Additional clock features include:
• Selectable system clock source between external
• Two-Speed Start-up mode, which minimizes
• Fail-Safe Clock Monitor (FSCM) designed to
• Oscillator Start-up Timer (OST) ensures stability
• Fast start-up oscillator allows internal circuits to
 2011 Microchip Technology Inc.
or internal sources via software.
latency between external oscillator start-up and
code execution.
detect a failure of the external clock source (LP,
XT, HS, EC or RC modes) and switch
automatically to the internal oscillator.
of crystal oscillator sources
power up and stabilize before switching to the 16
MHz HFINTOSC
OSCILLATOR MODULE (WITH
FAIL-SAFE CLOCK MONITOR)
Overview
Figure 5-1
Preliminary
The oscillator module can be configured in one of eight
clock modes.
1.
2.
3.
4.
5.
6.
7.
8.
Clock Source modes are selected by the FOSC<2:0>
bits in the Configuration Word 1. 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 LP, XT and HS
clock modes require an external crystal or resonator to
be connected to the device. Each mode is optimized for
a different frequency range. The RC clock mode
requires an external resistor and capacitor to set the
oscillator frequency.
The INTOSC internal oscillator block produces a low
and
LFINTOSC and HFINTOSC. (see Internal Oscillator
Block,
frequencies may be derived from these two clock
sources.
PIC16(L)F1516/7/8/9
ECL – External Clock Low Power mode
(0 MHz to 0.5 MHz)
ECM – External Clock Medium Power mode
(0.5 MHz to 4 MHz)
ECH – External Clock High Power mode
(4 MHz to 20 MHz)
LP – 32 kHz Low-Power Crystal mode.
XT – Medium Gain Crystal or Ceramic Resonator
Oscillator mode (up to 4 MHz)
HS – High Gain Crystal or Ceramic Resonator
mode (4 MHz to 20 MHz)
RC – External Resistor-Capacitor (RC).
INTOSC – Internal oscillator (31 kHz to 16 MHz).
high
Figure
frequency
5-1). A wide selection of device clock
clock
source,
DS41452B-page 51
designated