参数资料
型号: PIC16F676-E/P
厂商: Microchip Technology
文件页数: 86/132页
文件大小: 0K
描述: IC MCU FLASH 1KX14 W/AD 14DIP
产品培训模块: Asynchronous Stimulus
标准包装: 30
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 12
程序存储器容量: 1.75KB(1K x 14)
程序存储器类型: 闪存
EEPROM 大小: 128 x 8
RAM 容量: 64 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 14-DIP(0.300",7.62mm)
包装: 管件
配用: DM163029-ND - BOARD PICDEM FOR MECHATRONICS
2010 Microchip Technology Inc.
DS40039F-page 57
PIC16F630/676
9.2
Oscillator Configurations
9.2.1
OSCILLATOR TYPES
The PIC16F630/676 can be operated in eight different
Oscillator Option modes. The user can program three
Configuration bits (FOSC2 through FOSC0) to select
one of these eight modes:
LP
Low-Power Crystal
XT
Crystal/Resonator
HS
High Speed Crystal/Resonator
RC
External Resistor/Capacitor (2 modes)
INTOSC Internal Oscillator (2 modes)
EC
External Clock In
9.2.2
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 (see Figure 9-1). The PIC16F630/676 oscil-
lator design requires the use of a parallel cut crystal.
Use of a series cut crystal may yield a frequency
outside 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 (see
FIGURE 9-1:
CRYSTAL OPERATION (OR
CERAMIC RESONATOR)
(HS, XT OR LP OSC
CONFIGURATION)
FIGURE 9-2:
EXTERNAL CLOCK INPUT
OPERATION (HS, XT, EC,
OR LP OSC
CONFIGURATION)
TABLE 9-1:
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
TABLE 9-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
Note:
Additional information on oscillator config-
urations is available in the PIC Mid-Range
Reference Manual, (DS33023).
Note
1:
See Table 9-1 and Table 9-2 for recommended
values of C1 and C2.
2:
A series resistor may be required for AT strip cut
crystals.
3:
RF varies with the Oscillator mode selected
(Approx. value = 10 M
C1(1)
C2(1)
XTAL
OSC2
OSC1
RF(3)
Sleep
To Internal
PIC16F630/676
Logic
RS(2)
Ranges Characterized:
Mode
Freq
OSC1(C1)
OSC2(C2)
XT
455 kHz
2.0 MHz
4.0 MHz
68-100 pF
15-68 pF
68-100 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 oscillator 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 resonator manufacturer for
appropriate values of external
components.
Mode
Freq
OSC1(C1)
OSC2(C2)
LP
32 kHz
68-100 pF
XT
100 kHz
2 MHz
4 MHz
68-150 pF
15-30 pF
150-200 pF
15-30 pF
HS
8 MHz
10 MHz
20 MHz
15-30 pF
Note 1: Higher capacitance increases the stability
of the oscillator 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.
Clock from
External System
PIC16F630/676
OSC1
OSC2(1)
Open
Note 1: Functions as RA4 in EC Osc mode.
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