参数资料
型号: PIC16LC716-04/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件页数: 58/106页
文件大小: 1718K
代理商: PIC16LC716-04/SS
2005 Microchip Technology Inc.
DS41106B-page 53
PIC16C712/716
9.2
Oscillator Configurations
9.2.1
OSCILLATOR TYPES
The PIC16CXXX 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
9.2.2
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 specifica-
tions. When in XT, LP or HS modes, the device can
have an external clock source to drive the OSC1/
CLKIN pin (Figure 9-3).
FIGURE 9-2:
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
OSC CONFIGURATION)
FIGURE 9-3:
EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR
LP OSC
CONFIGURATION)
TABLE 9-1:
CERAMIC RESONATORS
TABLE 9-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
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
PIC16C7XX
RS(2)
internal
OSC1
OSC2
Open
Clock from
ext. system
PIC16C7XX
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
16.0 MHz
10-68 pF
10-22 pF
10-68 pF
10-22 pF
These values are for design guidance only. See
notes at bottom of page.
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
20 MHz
15-33 pF
These values are for design guidance only. See
notes at bottom of page.
Note 1:
Recommended values of C1 and C2 are
identical to the ranges tested (Table 9-1).
2:
Higher capacitance increases the stability
of the 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
appropriate values of external compo-
nents.
4:
Rs may be required in HS mode, as well
as XT mode to avoid overdriving crystals
with low drive level specification.
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