PIC16LF18854 Datasheet, PDF (112/668 Pages) Microchip Technology – C Compiler Optimized RISC Architecture

PIC16(L)F18856/76
FIGURE 6-3:
QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE)
PIC^® MCU
C1
Quartz
Crystal
OSC1/CLKIN
RF⁽²⁾
To Internal
Logic
Sleep
C2
RS⁽¹⁾
OSC2/CLKOUT
Note 1:
2:
A series resistor (RS) may be required for
quartz crystals with low drive level.
The value of RF varies with the Oscillator mode
selected (typically between 2 M to 10 M.
Note 1: Quartz crystal characteristics vary
according to type, package and
manufacturer. The user should consult the
manufacturer data sheets for specifications
and recommended application.
2: Always verify oscillator performance over
the VDD and temperature range that is
expected for the application.
3: For oscillator design assistance, reference
the following Microchip Application Notes:
• AN826, “Crystal Oscillator Basics and
Crystal Selection for rfPIC^® and PIC^®
Devices” (DS00826)
• AN849, “Basic PIC^® Oscillator Design”
(DS00849)
• AN943, “Practical PIC^® Oscillator
Analysis and Design” (DS00943)
• AN949, “Making Your Oscillator Work”
(DS00949)
FIGURE 6-4:
CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
PIC^® MCU
OSC1/CLKIN
C1
To Internal
Logic
RP⁽³⁾
RF⁽²⁾
Sleep
C2 _{Ceramic RS}⁽¹⁾
Resonator
OSC2/CLKOUT
Note 1: A series resistor (RS) may be required for
ceramic resonators with low drive level.
2: The value of RF varies with the Oscillator mode
selected (typically between 2 M to 10 M.
3: An additional parallel feedback resistor (RP)
may be required for proper ceramic resonator
operation.
6.2.1.3 Oscillator Start-up Timer (OST)
If the oscillator module is configured for LP, XT or HS
modes, the Oscillator Start-up Timer (OST) counts
1024 oscillations from OSC1. This occurs following a
Power-on Reset (POR), or a wake-up from Sleep. The
OST ensures that the oscillator circuit, using a quartz
crystal resonator or ceramic resonator, has started and
is providing a stable system clock to the oscillator
module.
DS40001824A-page 112
Preliminary
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