参数资料
型号: PIC16CR73-E/SP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDIP28
封装: 0.300 INCH, PLASTIC, DIP-28
文件页数: 166/172页
文件大小: 2964K
代理商: PIC16CR73-E/SP
2007 Microchip Technology Inc.
DS21993C-page 91
PIC16CR7X
12.2
Oscillator Configurations
12.2.1
OSCILLATOR TYPES
The PIC16CR7X can be operated in four different oscil-
lator modes. The user can program two Configuration
bits (FOSC1 and FOSC0) to select one of these four
modes:
LP
Low-Power Crystal
XT
Crystal/Resonator
HS
High-Speed Crystal/Resonator
RC
Resistor/Capacitor
12.2.2
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
In XT, LP or HS modes, a crystal or ceramic resonator is
connected to the OSC1/CLKIN and OSC2/CLKOUT
pins
to
establish
oscillation
The
PIC16CR7X oscillator design requires the use of a
parallel cut crystal. Use of a series cut crystal may give
a frequency out of the crystal manufacturers specifica-
tions. When in HS mode, the device can accept an
external clock source to drive the OSC1/CLKIN pin
See
or
(depending on the part number and VDD range) for valid
external clock frequencies.
FIGURE 12-1:
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
OSC CONFIGURATION)
FIGURE 12-2:
EXTERNAL CLOCK INPUT
OPERATION (HS OSC
CONFIGURATION)
TABLE 12-1:
CERAMIC RESONATORS
(FOR DESIGN GUIDANCE
ONLY)
Note 1:
See
and
for
recommended values of C1 and C2.
2:
A series resistor (RS) may be required for
AT strip cut crystals.
3:
RF varies with the crystal chosen.
C1(1)
C2(1)
XTAL
OSC2
OSC1
RF(3)
SLEEP
To
Logic
PIC16CR7X
RS(2)
Internal
Typical Capacitor Values Used:
Mode
Freq.
OSC1
OSC2
XT
455 kHz
2.0 MHz
4.0 MHz
56 pF
47 pF
33 pF
56 pF
47 pF
33 pF
HS
8.0 MHz
16.0 MHz
27 pF
22 pF
27 pF
22 pF
Capacitor values are for design guidance only.
These capacitors were tested with the resonators
listed below for basic start-up and operation. These
values were not optimized.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
VDD and temperature range for the application.
See the notes at the bottom of page 92 for additional
information.
Resonators Used:
455 kHz
Panasonic EFO-A455K04B
2.0 MHz
Murata Erie CSA2.00MG
4.0 MHz
Murata Erie CSA4.00MG
8.0 MHz
Murata Erie CSA8.00MT
16.0 MHz
Murata Erie CSA16.00MX
OSC1
OSC2
Open
Clock from
Ext. System
PIC16CR7X
(HS Mode)
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