參數(shù)資料
型號(hào)： 12CE673
廠商： Microchip Technology Inc.
英文描述： HookUp/Lead Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:Black; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1; Outer Diameter:0.144" RoHS Compliant: Yes
中文描述： 8引腳，8位CMOS微控制器與A / D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲(chǔ)器
文件頁(yè)數(shù)： 46/116頁(yè)
文件大?。?/td> 671K
代理商： 12CE673
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PIC12CE67X
DS40181B-page 46
Preliminary
1998 Microchip Technology Inc.
9.2
Oscillator Configurations
9.2.1
OSCILLATOR TYPES
The PIC12CE67X can be operated in seven different
oscillator modes. The user can program three
configuration bits (FOSC2:FOSC0) to select one of
these seven modes:
LP:
Low Power Crystal
HS:
High Speed Crystal Resonator
XT:
Crystal/Resonator
INTRC*:
Internal 4 MHz Oscillator
EXTRC*: External Resistor/Capacitor
*Can be configured to support CLKOUT
9.2.2
CRYSTAL OSCILLATOR / CERAMIC
RESONATORS
In XT, HS or LP modes, a crystal or ceramic resonator
is connected to the GP5/OSC1/CLKIN and GP4/OSC2
pins
to
establish
oscillation
PIC12CE67X 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, HS or LP modes, the
device can have an external clock source drive the
GP5/OSC1/CLKIN pin (Figure 9-3).
(Figure 9-2). The
FIGURE 9-2:
CRYSTAL OPERATION
(OR CERAMIC RESONATOR)
(XT, HS OR LP OSC
CONFIGURATION)
FIGURE 9-3:
EXTERNAL CLOCK INPUT
OPERATION (XT, HS OR LP
OSC CONFIGURATION)
Note 1: See Capacitor Selection tables 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
(approx. value = 10 M
).
C1
(1)
C2
(1)
XTAL
OSC2
OSC1
RF
(3)
SLEEP
To internal
logic
RS
(2)
PIC12CE67X
Clock from
ext. system
OSC1
OSC2
PIC12CE67X
Open
TABLE 9-1:
CAPACITOR SELECTION
FOR CERAMIC RESONATORS
- PIC12CE67X
Resonator
Freq
C1
455 kHz
2.0 MHz
4.0 MHz
15-68 pF
4.0 MHz
8.0 MHz
10.0 MHz
10-22 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.
TABLE 9-2:
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
- PIC12CE67X
Resonator
Freq
C1
32 kHz
(1)
100 kHz
200 kHz
15-30 pF
100 kHz
200 kHz
455 kHz
1 MHz
2 MHz
4 MHz
15-47 pF
4 MHz
8 MHz
10 MHz
15-30 pF
Note 1: For V
DD
> 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.
Osc
Type
XT
Cap. Range
Cap. Range
C2
22-100 pF
15-68 pF
15-68 pF
15-68 pF
10-68 pF
10-22 pF
22-100 pF
15-68 pF
HS
15-68 pF
10-68 pF
Osc
Type
LP
Cap.Range
Cap. Range
C2
15 pF
30-47 pF
15-82 pF
200-300 pF
100-200 pF
15-100 pF
15-30 pF
15-30 pF
15-47 pF
15-30 pF
15-30 pF
15-30 pF
15 pF
15-30 pF
XT
15-30 pF
15-30 pF
15-30 pF
15-30 pF
15-30 pF
HS
15-30 pF
15-30 pF
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