您的位置：维库电子市场网 > Datasheet > PIC18F6720

PIC18F6720 Datasheet

  • PIC18F6720

  • 64/80-Pin High-Performance,256 Kbit to 1 Mbit Enhanced Flash...

  • 3274.08KB

  • 380页

  • Microchip   Microchip

阅览下载 纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

PIC18F6520/8520/6620/8620/6720/8720
2.4
External Clock Input
FIGURE 2-5:
The EC and ECIO Oscillator modes require an external
clock source to be connected to the OSC1 pin. The
feedback device between OSC1 and OSC2 is turned
off in these modes to save current. There is a maximum
1.5
碌s
start-up required after a Power-on Reset, or
wake-up from Sleep mode.
In the EC Oscillator mode, the oscillator frequency
divided by 4 is available on the OSC2 pin. This signal
may be used for test purposes or to synchronize other
logic. Figure 2-4 shows the pin connections for the EC
Oscillator mode.
EXTERNAL CLOCK INPUT
OPERATION
(ECIO CONFIGURATION)
OSC1
Clock from
Ext. System
RA6
PIC18FXX20
I/O (OSC2)
2.5
HS/PLL
FIGURE 2-4:
EXTERNAL CLOCK INPUT
OPERATION
(EC CONFIGURATION)
OSC1
A Phase Locked Loop circuit (PLL) is provided as a
programmable option for users that want to multiply the
frequency of the incoming crystal oscillator signal by 4.
For an input clock frequency of 10 MHz, the internal
clock frequency will be multiplied to 40 MHz. This is
useful for customers who are concerned with EMI due
to high-frequency crystals.
The PLL is one of the modes of the FOSC<2:0> config-
uration bits. The oscillator mode is specified during
device programming.
The PLL can only be enabled when the oscillator con-
figuration bits are programmed for HS mode. If they are
programmed for any other mode, the PLL is not
enabled and the system clock will come directly from
OSC1. Also, PLL operation cannot be changed 鈥渙n-
the-fly鈥? To enable or disable it, the controller must
either cycle through a Power-on Reset, or switch the
clock source from the main oscillator to the Timer1
oscillator and back again. See
Section 2.6 鈥淥scillator
Switching Feature鈥?/span>
for details on oscillator switching.
A PLL lock timer is used to ensure that the PLL has
locked before device execution starts. The PLL lock
timer has a time-out that is called T
PLL
.
Clock from
Ext. System
F
OSC
/4
PIC18FXX20
OSC2
The ECIO Oscillator mode functions like the EC mode,
except that the OSC2 pin becomes an additional gen-
eral purpose I/O pin. The I/O pin becomes bit 6 of
PORTA (RA6). Figure 2-5 shows the pin connections
for the ECIO Oscillator mode.
FIGURE 2-6:
PLL BLOCK DIAGRAM
HS Osc
PLL Enable
Phase
Comparator
F
IN
F
OUT
Loop
Filter
VCO
SYSCLK
(from Configuration
bit Register)
OSC2
Crystal
Osc
OSC1
Divide by 4
铮?/div>
2004 Microchip Technology Inc.
DS39609B-page 23
MUX

PIC18F6720相关型号PDF文件下载

  • 型号
    版本
    描述
    厂商
    下载
  • PIC12
    英文版
    8-Pin FLASH-Based 8-Bit CMOS Microcontrollers
    MICROCHIP
    PIC12
  • PIC12
    英文版
    8-Pin, 8-Bit CMOS Microcontroller with EEPROM Data Memory
    MICROCHIP ...
    PIC12
  • PIC12
    英文版
    8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEP...
    MICROCHIP ...
    PIC12
  • PIC12
    英文版
    8-Pin, 8-Bit CMOS Microcontrollers
    MICROCHIP ...
    PIC12
  • PIC12
    英文版
    EPROM Memory Programming Specification
    MICROCHIP ...
    PIC12
  • PIC12
    英文版
    8-Pin FLASH-Based 8-Bit CMOS Microcontrollers
    MICROCHIP ...
    PIC12
  • PIC18
    英文版
    Microcontroller
    MICROCHIP
    PIC18
  • PIC10F
    英文版
    Microcontroller 
    Microchip
    PIC10F
  • PIC1657
    英文版
    Microcontroller
    ETC
    PIC1657
  • PIC16C5
    英文版
    EPROM-Based 8-Bit CMOS Microcontroller
    MICROCHIP
    PIC16C5
  • PIC12C50
    英文版
    8-Pin, 8-Bit CMOS Microcontrollers
    MICROCHIP
    PIC12C50
  • PIC12C50
    英文版
    8-Pin, 8-Bit CMOS Microcontrollers
    MICROCHIP ...
    PIC12C50
  • PIC12C5X
    英文版
    ETC
    PIC12C5X
  • PIC12C67
    英文版
    EPROM Memory Programming Specification
    MICROCHIP
    PIC12C67
  • PIC12C67
    英文版
    EPROM Memory Programming Specification
    MICROCHIP ...
    PIC12C67
  • PIC14000
    英文版
    28-Pin Programmable Mixed Signal Controller
    Microchip
    PIC14000
  • PIC14000
    英文版
    EPROM Memory Programming Specification
    Microchip
    PIC14000
  • PIC1657I
    英文版
    Microcontroller
    ETC
    PIC1657I
  • PIC1657M
    英文版
    Microcontroller
    ETC
    PIC1657M
  • PIC16C52
    英文版
    EPROM/ROM-Based 8-Bit CMOS Microcontroller Series
    MICROCHIP
    PIC16C52

您可能感兴趣的PDF文件资料

热门IC型号推荐

©2024 维库电子市场网（www.dzsc.com）　备案号：浙B2-20050339-1 经营许可证：浙B2-20210386版权声明
买家服务热线：0571-85317607 | 买家服务部QQ： QQ:1609526468
卖家服务热线：0571-85317607 | 卖家服务部QQ： QQ:331652727

扫码下载APP，
一键连接广大的电子世界。

在线人工客服

买家服务：
卖家服务：

0571-85317607

客服在线时间周一至周五
9:00-17:30

关注官方微信号，
第一时间获取资讯。

建议反馈
返回顶部

建议反馈

联系人：

联系方式：

按住滑块，拖拽到最右边
>>
感谢您向阿库提出的宝贵意见，您的参与是维库提升服务的动力！意见一经采纳，将有感恩红包奉上哦！

PDF纠错X

投诉电话：0571-85317607 投诉QQ：

如选匿名将无法为您反馈投诉结果，建议实名投诉！