參數(shù)資料
型號： PIC16F873
廠商： Microchip Technology, Inc.
元件分類： 8位微控制器
英文描述： Enhanced FLASH/EEPROM 8-Bit Microcontroller With A/D Module
中文描述： 帶A/D模塊的增強型閃存/EEPROM 8位微控制器（驅(qū)動/吸收電流高，工作電壓2.5-5.5V的微控制器）
文件頁數(shù)： 95/170頁
文件大小： 4191K
代理商： PIC16F873
2003 Microchip Technology Inc.
Preliminary
DS40300C-page 93
PIC16F62X
14.2
Oscillator Configurations
14.2.1
OSCILLATOR TYPES
The PIC16F62X can be operated in eight different
oscillator options. The user can program three
configuration bits (FOSC2 thru FOSC0) to select one of
these eight modes:
LP
Low Power Crystal
XT
Crystal/Resonator
HS
High Speed Crystal/Resonator
ER
External Resistor (2 modes)
INTRC
Internal Resistor/Capacitor (2 modes)
EC
External Clock In
14.2.2
CRYSTAL OSCILLATOR / CERAMIC
RESONATORS
In XT, LP or HS modes a crystal or ceramic resonator
is connected to the OSC1 and OSC2 pins to establish
oscillation (Figure 14-1). The PIC16F62X 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 to drive the OSC1 pin (Figure 14-4).
FIGURE 14-1:
CRYSTAL OPERATION
(OR CERAMIC
RESONATOR) (HS, XT OR
LP OSC
CONFIGURATION)
TABLE 14-1:
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
TABLE 14-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
14.2.3
EXTERNAL CRYSTAL OSCILLATOR
CIRCUIT
Either a prepackaged oscillator can be used, or a
simple oscillator circuit with TTL gates can be built.
Prepackaged oscillators provide a wide operating
range and better stability. A well-designed crystal
oscillator will provide good performance with TTL
gates. Two types of crystal oscillator circuits can be
used; one with series resonance, or one with parallel
resonance.
Figure 14-2 shows implementation of a parallel
resonant oscillator circuit. The circuit is designed to use
the fundamental frequency of the crystal. The 74AS04
inverter performs the 180
°
phase shift that a parallel
oscillator requires. The 4.7 k
resistor provides the
negative
feedback
for
potentiometers bias the 74AS04 in the linear region.
This could be used for external oscillator designs.
stability.
The
10 k
Note
1:
A series resistor may be required for some crys-
tals.
See Table 14-1 and Table 14-2 for recommended
values of C1 and C2.
2:
C1
C2
XTAL
OSC2
RS
OSC1
RF
SLEEP
PIC16F62X
NOTE 1
F
OSC
Ranges Characterized:
Mode
Freq
OSC1(C1)
OSC2(C2)
XT
455 kHz
2.0 MHz
4.0 MHz
22 - 100 pF
15 - 68 pF
15 - 68 pF
22 - 100 pF
15 - 68 pF
15 - 68 pF
HS
8.0 MHz
16.0 MHz
10 - 68 pF
10 - 22 pF
10 - 68 pF
10 - 22 pF
Note
1:
Higher capacitance increases the stability of the oscilla-
tor but also increases the start-up time. These values
are for design guidance only. Since each resonator has
its own characteristics, the user should consult the res-
onator manufacturer for appropriate values of external
components.
Mode
Freq
OSC1(C1)
OSC2(C2)
LP
32 kHz
200 kHz
68 - 100 pF
15 - 30 pF
68 - 100 pF
15 - 30 pF
XT
100 kHz
2 MHz
4 MHz
68 - 150 pF
15 - 30 pF
15 - 30 pF
150 - 200 pF
15 - 30 pF
15 - 30 pF
HS
8 MHz
10 MHz
20 MHz
15 - 30 pF
15 - 30 pF
15 - 30 pF
15 - 30 pF
15 - 30 pF
15 - 30 pF
Note
1:
Higher capacitance increases the stability of the oscilla-
tor but also increases the start-up time. 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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F873-04/SO 功能描述:8位微控制器 -MCU 7KB 192 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F873-04/SO 制造商:Microchip Technology Inc 功能描述:8BIT FLASH MCU SMD 16F873 SOIC28
PIC16F873-04/SP 功能描述:8位微控制器 -MCU 7KB 192 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F873-04/SP 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 16F873 SDIL28
PIC16F873-04E/SO 功能描述:8位微控制器 -MCU 7KB 192 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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