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| 型号： | MCV18E-I/P |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDIP18 |
| 封装： | 0.300 INCH, LEAD FREE, PLASTIC, DIP-18 |
| 文件页数： | 73/108页 |
| 文件大小： | 1509K |
| 代理商： | MCV18E-I/P |
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2009 Microchip Technology Inc.
DS41399A-page 67
MCV18E
9.2
Oscillator Configurations
9.2.1
OSCILLATOR TYPES
The MCV18E 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 (Figure 9-1). The MCV18E
oscillator design requires the use of a parallel cut crys-
tal. 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 9-2).
FIGURE 9-1:
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
OSC CONFIGURATION)
FIGURE 9-2:
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:
recommended values of C1 and C2.
2:
A series resistor (RS) may be required.
3:
RF varies with the crystal chosen.
C1(1)
C2(1)
XTAL
OSC2
OSC1
RF(3)
Sleep
To
logic
MCV18E
RS(2)
internal
OSC1
OSC2
Open
Clock from
ext. system
MCV18E
Ranges Tested:
Mode
Freq.
OSC1 (C1)
OSC2 (C2)
XT
455 kHz
2.0 MHz
68-100 pF
15-68 pF
68-100 pF
15-68 pF
HS
4.0 MHz
8.0 MHz
16.0 MHz
10-68 pF
15-68 pF
10-22 pF
10-68 pF
15-68 pF
10-22 pF
Note 1:
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
15-33 pF
200 kHz
5-10 pF
XT
200 kHz
47-68 pF
1 MHz
15-33 pF
4 MHz
15-33 pF
HS
4 MHz
15-33 pF
8 MHz
15-33 pF
20 MHz
15-33 pF
Note 1:
These values are for design guidance
only. See notes at bottom of page.
Note 1: Higher capacitance increases the stability
of the oscillator, but also increases the
start-up time.
2: Since each resonator/crystal has its own
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate
values
of
external
components.
3: RS may be required to avoid overdriving
crystals with low drive level specification.
4: When using an external clock for the
OSC1 input, loading of the OSC2 pin
must be kept to a minimum by leaving the
OSC2 pin unconnected.
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