參數(shù)資料
型號(hào)： PIC16CR7X
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 93/172頁
文件大小： 1506K
代理商： PIC16CR7X
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 (Figure 12-1). 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
(Figure 12-2).
See
Figure 15-1
(depending on the part number and V
DD
range) for valid
external clock frequencies.
or
Figure 15-2
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
recommended values of C1 and C2.
A series resistor (RS) may be required for
AT strip cut crystals.
RF varies with the crystal chosen.
Table 12-1
and
Table 12-2
for
2:
3:
C1
(1)
C2
(1)
XTAL
OSC2
OSC1
RF
(3)
SLEEP
To
Internal
Logic
PIC16CR7X
RS
(2)
Typical Capacitor Values Used:
Mode
Freq.
OSC1
OSC2
XT
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
16.0 MHz
56 pF
47 pF
33 pF
27 pF
22 pF
56 pF
47 pF
33 pF
27 pF
22 pF
HS
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
V
DD
and temperature range for the application.
See the notes at the bottom of page 92 for additional
information.
Resonators Used:
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
16.0 MHz
Panasonic EFO-A455K04B
Murata Erie CSA2.00MG
Murata Erie CSA4.00MG
Murata Erie CSA8.00MT
Murata Erie CSA16.00MX
OSC1
OSC2
Open
Clock from
Ext. System
PIC16CR7X
(HS Mode)
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