參數(shù)資料
型號(hào)： 16F872
廠商： Microchip Technology Inc.
英文描述： CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT
中文描述： 28引腳，8位閃存微控制器的CMOS
文件頁數(shù)： 97/160頁
文件大?。?/td> 2600K
代理商： 16F872
1999 Microchip Technology Inc.
Preliminary
DS30221A-page 97
PIC16F872
11.2
Oscillator Configurations
11.2.1
OSCILLATOR TYPES
The PIC16F872 can be operated in four different oscil-
lator 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
11.2.2
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 11-1). The
PIC16F872 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 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 CONFIGURATION)
TABLE 11-1:
CERAMIC RESONATORS
Note 1:
See Table 11-1 and Table 11-2 for rec-
ommended 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
internal
logic
PIC16F872
RS
(2)
OSC1
OSC2
Open
Clock from
ext. system
PIC16F872
Ranges Tested:
Mode
Freq
OSC1
OSC2
XT
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
16.0 MHz
68 - 100 pF
15 - 68 pF
15 - 68 pF
10 - 68 pF
10 - 22 pF
68 - 100 pF
15 - 68 pF
15 - 68 pF
10 - 68 pF
10 - 22 pF
HS
These values are for design guidance only.
See
notes at bottom of page.
Resonators Used:
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
16.0 MHz
All resonators used did not have built-in capacitors.
Panasonic EFO-A455K04B
Murata Erie CSA2.00MG
Murata Erie CSA4.00MG
Murata Erie CSA8.00MT
Murata Erie CSA16.00MX
±
0.3%
±
0.5%
±
0.5%
±
0.5%
±
0.5%
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