參數(shù)資料
PIC16C9XX
DS30444E - page 104
1997 Microchip Technology Inc.
14.2
Oscillator Congurations
14.2.1
OSCILLATOR TYPES
The PIC16CXXX can be operated in four different oscil-
lator modes. The user can program two conguration
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
14.2.2
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
PIC16CXXX oscillator design requires the use of a par-
allel cut crystal. Use of a series cut crystal may give a
frequency out of the crystal manufacturers specica-
tions. When in XT, LP or HS modes, the device can
have an external clock source to drive the OSC1/CLKIN
FIGURE 14-2: CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
OSC CONFIGURATION)
FIGURE 14-3: EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR LP
OSC CONFIGURATION)
C1
C2
XTAL
OSC2
Note1
OSC1
RF
SLEEP
To internal
logic
PIC16CXXX
RS
See Table 14-1 and Table 14-2 for recommended
values of C1 and C2.
Note 1: A series resistor may be required for AT
strip cut crystals.
OSC1
OSC2
Open
Clock from
ext. system
PIC16CXXX
TABLE 14-1: CERAMIC RESONATORS
TABLE 14-2: CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
Ranges Tested:
Mode
Freq
OSC1
OSC2
XT
455 kHz
2.0 MHz
4.0 MHz
68 - 100 pF
15 - 68 pF
68 - 100 pF
15 - 68 pF
HS
8.0 MHz
10 - 68 pF
These values are for design guidance only. See
notes at bottom of page.
Resonators Used:
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%
All resonators used did not have built-in capacitors.
Osc Type
Crystal
Freq
Cap. Range
C1
Cap. Range
C2
LP
32 kHz
33 pF
200 kHz
15 pF
XT
200 kHz
47-68 pF
1 MHz
15 pF
4 MHz
15 pF
HS
4 MHz
15 pF
8 MHz
15-33 pF
These values are for design guidance only. See
notes at bottom of page.
Crystals Used
32 kHz
Epson C-001R32.768K-A
± 20 PPM
200 kHz
STD XTL 200.000KHz
± 20 PPM
1 MHz
ECS ECS-10-13-1
± 50 PPM
4 MHz
ECS ECS-40-20-1
± 50 PPM
8 MHz
EPSON CA-301 8.000M-C
± 30 PPM
Note 1: Recommended values of C1 and C2 are
identical to the ranges tested (Table 14-1).
2: Higher capacitance increases the stability
of oscillator but also increases the start-up
time.
3: Since each resonator/crystal has its own
characteristics, the user should consult the
resonator/crystal manufacturer for appropri-
ate values of external components.
4: Rs may be required in HS mode as well as
XT mode to avoid overdriving crystals with
low drive level specication.
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