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PIC16CR83 데이터시트(PDF) 39 Page - Microchip Technology

부품명 PIC16CR83
상세설명  18-pin Flash/EEPROM 8-Bit Microcontrollers
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PIC16F8X
© 1998 Microchip Technology Inc.
DS30430C-page 39
8.2
Oscillator Configurations
8.2.1
OSCILLATOR TYPES
The PIC16F8X can be operated in four different
oscillator
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
8.2.2
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 8-3).
FIGURE 8-3:
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP OSC
CONFIGURATION)
The PIC16F8X 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
specifications. When in XT, LP or HS modes, the device
can have an external clock source to drive the
OSC1/CLKIN pin (Figure 8-4).
FIGURE 8-4:
EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR LP
OSC CONFIGURATION)
TABLE 8-1
CAPACITOR SELECTION
FOR CERAMIC RESONATORS
TABLE 8-2
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
Note1:
See Table 8-1 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
PIC16FXX
RS(2)
internal
OSC1
OSC2
Open
Clock from
ext. system
PIC16FXX
Ranges Tested:
Mode
Freq
OSC1/C1
OSC2/C2
XT
455 kHz
2.0 MHz
4.0 MHz
47 - 100 pF
15 - 33 pF
15 - 33 pF
47 - 100 pF
15 - 33 pF
15 - 33 pF
HS
8.0 MHz
10.0 MHz
15 - 33 pF
15 - 33 pF
15 - 33 pF
15 - 33 pF
Note :
Recommended values of C1 and C2 are identical to
the ranges tested table.
Higher capacitance increases the stability of the
oscillator but also increases the start-up time.
These values are for design guidance only. Since
each resonator has its own characteristics, the user
should consult the resonator manufacturer for the
appropriate values of external components.
Resonators Tested:
455 kHz
Panasonic EFO-A455K04B
± 0.3%
2.0 MHz
Murata Erie CSA2.00MG
± 0.5%
4.0 MHz
Murata Erie CSA4.00MG
± 0.5%
8.0 MHz
Murata Erie CSA8.00MT
± 0.5%
10.0 MHz
Murata Erie CSA10.00MTZ
± 0.5%
None of the resonators had built-in capacitors.
Mode
Freq
OSC1/C1
OSC2/C2
LP
32 kHz
200 kHz
68 - 100 pF
15 - 33 pF
68 - 100 pF
15 - 33 pF
XT
100 kHz
2 MHz
4 MHz
100 - 150 pF
15 - 33 pF
15 - 33 pF
100 - 150 pF
15 - 33 pF
15 - 33 pF
HS
4 MHz
10 MHz
15 - 33 pF
15 - 33 pF
15 - 33 pF
15 - 33 pF
Note :
Higher capacitance increases the stability of
oscillator but also increases the start-up time.
These values are for design guidance only. Rs may
be required in HS mode as well as XT mode to
avoid overdriving crystals with low drive level spec-
ification. Since each crystal has its own characteris-
tics, the user should consult the crystal
manufacturer for appropriate values of external
components.
For VDD > 4.5V, C1 = C2
≈ 30 pF is recommended.
Crystals Tested:
32.768 kHz
Epson C-001R32.768K-A
± 20 PPM
100 kHz
Epson C-2 100.00 KC-P
± 20 PPM
200 kHz
STD XTL 200.000 KHz
± 20 PPM
1.0 MHz
ECS ECS-10-13-2
± 50 PPM
2.0 MHz
ECS ECS-20-S-2
± 50 PPM
4.0 MHz
ECS ECS-40-S-4
± 50 PPM
10.0 MHz
ECS ECS-100-S-4
± 50 PPM


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