欢迎访问ic37.com |
会员登录 免费注册
发布采购

PIC16F687-I/ML 参数 Datasheet PDF下载

PIC16F687-I/ML图片预览
型号: PIC16F687-I/ML
PDF下载: 下载PDF文件 查看货源
内容描述: 20引脚基于闪存的8位CMOS微控制器采用纳瓦技术 [20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology]
分类和应用: 闪存微控制器和处理器外围集成电路时钟
文件页数/大小: 294 页 / 5272 K
品牌: MICROCHIP [ MICROCHIP ]
 浏览型号PIC16F687-I/ML的Datasheet PDF文件第45页浏览型号PIC16F687-I/ML的Datasheet PDF文件第46页浏览型号PIC16F687-I/ML的Datasheet PDF文件第47页浏览型号PIC16F687-I/ML的Datasheet PDF文件第48页浏览型号PIC16F687-I/ML的Datasheet PDF文件第50页浏览型号PIC16F687-I/ML的Datasheet PDF文件第51页浏览型号PIC16F687-I/ML的Datasheet PDF文件第52页浏览型号PIC16F687-I/ML的Datasheet PDF文件第53页  
PIC16F631/677/685/687/689/690  
The Oscillator module can be configured in one of eight  
clock modes.  
3.0  
3.1  
OSCILLATOR MODULE (WITH  
FAIL-SAFE CLOCK MONITOR)  
1. EC – External clock with I/O on OSC2/CLKOUT.  
2. LP – 32 kHz Low-Power Crystal mode.  
Overview  
3. XT – Medium Gain Crystal or Ceramic Resonator  
Oscillator mode.  
The Oscillator module has a wide variety of clock  
sources and selection features that allow it to be used  
in a wide range of applications while maximizing perfor-  
mance and minimizing power consumption. Figure 3-1  
illustrates a block diagram of the Oscillator module.  
4. HS – High Gain Crystal or Ceramic Resonator  
mode.  
5. RC – External Resistor-Capacitor (RC) with  
FOSC/4 output on OSC2/CLKOUT.  
Clock sources can be configured from external  
oscillators, quartz crystal resonators, ceramic resonators  
and Resistor-Capacitor (RC) circuits. In addition, the  
system clock source can be configured from one of two  
internal oscillators, with a choice of speeds selectable via  
software. Additional clock features include:  
6. RCIO – External Resistor-Capacitor (RC) with  
I/O on OSC2/CLKOUT.  
7. INTOSC – Internal oscillator with FOSC/4 output  
on OSC2 and I/O on OSC1/CLKIN.  
8. INTOSCIO – Internal oscillator with I/O on  
OSC1/CLKIN and OSC2/CLKOUT.  
• Selectable system clock source between external  
or internal via software.  
Clock Source modes are configured by the FOSC<2:0>  
bits in the Configuration Word register (CONFIG). The  
internal clock can be generated from two internal  
oscillators. The HFINTOSC is a calibrated high-  
frequency oscillator. The LFINTOSC is an uncalibrated  
low-frequency oscillator.  
• Two-Speed Start-up mode, which minimizes  
latency between external oscillator start-up and  
code execution.  
• Fail-Safe Clock Monitor (FSCM) designed to  
detect a failure of the external clock source (LP,  
XT, HS, EC or RC modes) and switch  
automatically to the internal oscillator.  
FIGURE 3-1:  
PIC® MCU CLOCK SOURCE BLOCK DIAGRAM  
FOSC<2:0>  
(Configuration Word Register)  
External Oscillator  
SCS<0>  
(OSCCON Register)  
OSC2  
OSC1  
Sleep  
LP, XT, HS, RC, RCIO, EC  
IRCF<2:0>  
(OSCCON Register)  
System Clock  
(CPU and Peripherals)  
8 MHz  
111  
110  
101  
INTOSC  
Internal Oscillator  
4 MHz  
2 MHz  
1 MHz  
HFINTOSC  
8 MHz  
100  
011  
010  
001  
000  
500 kHz  
250 kHz  
125 kHz  
31 kHz  
LFINTOSC  
31 kHz  
Power-up Timer (PWRT)  
Watchdog Timer (WDT)  
Fail-Safe Clock Monitor (FSCM)  
© 2007 Microchip Technology Inc.  
DS41262D-page 47  
 复制成功!