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| 型號： | P12C508 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8-Pin, 8-Bit CMOS Microcontroller |
| 中文描述： | 8引腳，8位CMOS微控制器 |
| 文件頁數(shù)： | 26/84頁 |
| 文件大?。?/td> | 526K |
| 代理商： | P12C508 |
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PIC12C5XX
DS40139A-page 26
Advanced Information
1996 Microchip Technology Inc.
7.2
Oscillator Configurations
7.2.1
OSCILLATOR TYPES
The PIC12C5XX 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
INTRC: Internal 4 MHz Oscillator
EXTRC: External Resistor/Capacitor
7.2.2
CRYSTAL OSCILLATOR / CERAMIC
RESONATORS
In XT or LP modes, a crystal or ceramic resonator is
connected to the GP5/OSC1/CLKIN and GP4/OSC2
pins to establish oscillation (Figure 7-2). The
PIC12C5XX 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 or LP modes, the device
can have an external clock source drive the GP5/
OSC1/CLKIN pin (Figure 7-3).
FIGURE 7-2:
CRYSTAL OPERATION (OR
CERAMIC RESONATOR) (XT
OR LP OSC
CONFIGURATION)
FIGURE 7-3:
EXTERNAL CLOCK INPUT
OPERATION (XT 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)
PIC12C5XX
Clock from
ext. system
OSC1
OSC2
PIC12C5XX
Open
TABLE 7-1:
CAPACITOR SELECTION
FOR CERAMIC RESONATORS
- PIC12C5XX
Resonator
Freq
C1
455 kHz
2.0 MHz
4.0 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 7-2:
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
- PIC12C5XX
Resonator
Freq
C1
32 kHz
(1)
15 pF
100 kHz
200 kHz
455 kHz
1 MHz
2 MHz
4 MHz
15 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
68-100 pF
15-33 pF
10-22 pF
68-100 pF
15-33 pF
Osc
Type
LP
XT
Cap.Range
Cap. Range
C2
15 pF
200-300 pF
100-200 pF
15-100 pF
15-30 pF
15 pF
15 pF
15-30 pF
15-30 pF
15-30 pF
15-30 pF
15 pF
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