參數(shù)資料
型號(hào)： 16F628
廠商： Microchip Technology Inc.
英文描述： CAT 5E CROSSOVER PATCH CORD CABLE BLUE 1 FT
中文描述： 基于閃存的8位CMOS微控制器
文件頁數(shù)： 98/168頁
文件大?。?/td> 3760K
代理商： 16F628
PIC16F627A/628A/648A
DS40044A-page 96
Preliminary
2002 Microchip Technology Inc.
FIGURE 14-2:
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
Figure 14-3 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental
frequency of the crystal. The inverter performs a 180
°
phase shift in a series resonant oscillator circuit. The
330 k
resistors provide the negative feedback to bias
the inverters in their linear region.
FIGURE 14-3:
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
14.2.4
PRECISION INTERNAL 4 MH
Z
OSCILLATOR
The internal precision oscillator provides a fixed 4 MHz
(nominal) system clock at V
DD
= 5 V and 25
°
C. See
Section 17.0, Electrical Specifications, for information
on variation over voltage and temperature.
14.2.5
EXTERNAL CLOCK IN
For applications where a clock is already available
elsewhere, users may directly drive the PIC16F627A/
628A/648A provided that this external clock source
meets the AC/DC timing requirements listed in
Section 17.6. Figure 14-4 below shows how an exter-
nal clock circuit should be configured.
FIGURE 14-4:
EXTERNAL CLOCK INPUT
OPERATION (EC, HS, XT
OR LP OSC
CONFIGURATION)
14.2.6
RC OSCILLATOR
For applications where precise timing is not a require-
ment, the RC oscillator option is available. The opera-
tion and functionality of the RC oscillator is dependent
upon a number of variables. The RC oscillator fre-
quency is a function of:
Supply voltage
Resistor (R
EXT
) and capacitor (C
EXT
) values
Operating temperature.
The oscillator frequency will vary from unit to unit due
to normal process parameter variation. The difference
in lead frame capacitance between package types will
also affect the oscillation frequency, especially for low
C
EXT
values. The user also needs to account for the
tolerance of the external R and C components.
Figure 14-5 shows how the R/C combination is con-
nected.
FIGURE 14-5:
RC OSCILLATOR MODE
The RC Oscillator mode has two options that control
the unused OSC2 pin. The first allows it to be used as
a general purpose I/O port. The other configures the
pin as an output providing the Fosc signal (internal
clock divided by 4) for test or external synchronization
purposes.
14.2.7
CLKOUT
The PIC16F627A/628A/648A can be configured to pro-
vide a clock out signal by programming the configura-
tion word. The oscillator frequency, divided by 4 can be
used for test purposes or to synchronize other logic.
+5V
10K
4.7K
10K
74AS04
XTAL
10K
74AS04
PIC16F627A/628A/648A
CLKIN
TO OTHER
DEVICES
C1
C2
330 K
74AS04
74AS04
PIC16F627A/
628A/648A
CLKIN
TO OTHER
DEVICES
XTAL
330 K
74AS04
0.1 PF
Clock From
ext. system
PIC16F627A/628A/648A
RA6
RA7/OSC1/CLKIN
RA6/OSC2/CLKOUT
C
EXT
V
DD
R
EXT
V
SS
PIC16F627A/628A/648A
F
OSC
/4
Internal
Clock
CLKIN
RA7/OSC1/
RA6/OSC2/CLKOUT
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