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參數(shù)資料
| 型號： | MTA85802S-04I/SS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 17/72頁 |
| 文件大?。?/td> | 760K |
| 代理商： | MTA85802S-04I/SS |
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MTA85XXX
DS40115C-page 24
1995 Microchip Technology Inc.
11.0
OSCILLATOR
CONFIGURATIONS
11.0.1
OSCILLATOR TYPES
The PIC16C5X can be operated in four different
oscillator
modes.
The
user
can
program
two
configuration bits (FOSC1:FOSC0) to select one of
these four modes:
LP:
Low Power Crystal
XT:
Crystal/Resonator
HS:
High Speed Crystal/Resonator
RC:
Resistor/Capacitor
11.0.2
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 11-1).
The
PIC16C5X 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 drive the OSC1/
CLKIN pin (Figure 11-2).
FIGURE 11-1: CRYSTAL /CERAMIC
RESONATOR OPERATION
(HS, XT OR LP OSC
CONFIGURATION)
FIGURE 11-2: EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR LP
OSC MODE)
Note:
The MTA854XX operates at 4 MHz and
the MTA858XX operates up to 10 MHz.
See Table 11-1 and Table 11-2 for recommended
values of C1 and C2.
Note 1: A series resistor may be required for AT
strip cut crystals.
C1
C2
XTAL
OSC2
Note1
OSC1
RF
SLEEP
To internal
logic
RS
PIC16C5X
Clock from
ext. system
OSC1
OSC2
PIC16C5X
Open
TABLE 11-1:
CAPACITOR SELECTION
FOR CERAMIC RESONATORS
TABLE 11-2:
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
Osc
Type
Resonator
Freq.
Cap. Range
C1
Cap. Range
C2
XT
455 kHz
2.0 MHz
4.0 MHz
22-100 pF
15-68 pF
22-100 pF
15-68 pF
HS
8.0 MHz
10-68 pF
These values are for design guidance only. Since
each resonator has its own characteristics, the user
should consult the resonator manufacturer for
appropriate values of external components.
Osc
Type
Resonator
Freq.
Cap. Range
C1
Cap. Range
C2
LP
32 kHz
200 kHz
33-68 pF
15-47 pF
33-68 pF
15-47 pF
XT
100 kHz
2 MHz
4 MHz
47-100 pF
15-33 pF
10-33 pF
47-100 pF
15-33 pF
10-33 pF
HS
8 MHz
15-47 pF
For VDD > 4.5V, C1 = C2
≈ 30 pF is recommended.
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 specification.
Since each crystal has its own characteristics, the
user should consult the crystal manufacturer for
appropriate values of external components.
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