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参数资料
型号： PIC18LF4221-I/ML
厂商： Microchip Technology
文件页数： 40/110页
文件大小： 0K
描述： IC PIC MCU FLASH 2KX16 44QFN
产品培训模块： Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
标准包装： 45
系列： PIC® 18F
核心处理器： PIC
芯体尺寸： 8-位
速度： 40MHz
连通性： I²C，SPI，UART/USART
外围设备： 欠压检测/复位，HLVD，POR，PWM，WDT
输入/输出数： 36
程序存储器容量： 4KB（2K x 16）
程序存储器类型： 闪存
EEPROM 大小： 256 x 8
RAM 容量： 512 x 8
电压 - 电源 (Vcc/Vdd)： 2 V ~ 5.5 V
数据转换器： A/D 13x10b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 44-VQFN 裸露焊盘
包装： 管件
产品目录页面： 642 (CN2011-ZH PDF)
2009 Microchip Technology Inc.
DS39689F-page 35
PIC18F2221/2321/4221/4321 FAMILY
3.7
Clock Sources and Oscillator
Switching
The PIC18F2221/2321/4221/4321 family of devices
includes a feature that allows the device clock source
to be switched from the main oscillator to an alternate
clock source. These devices also offer two alternate
clock sources. When an alternate clock source is
enabled, the various power-managed operating modes
are available.
Essentially, there are three clock sources for these
devices:
Primary oscillators
Secondary oscillators
Internal oscillator block
The primary oscillators include the External Crystal
and Resonator modes, the External RC modes, the
External Clock modes and the internal oscillator block.
The particular mode is defined by the FOSC<3:0> Con-
figuration bits. The details of these modes are covered
earlier in this chapter.
The secondary oscillators are those external sources
not connected to the OSC1 or OSC2 pins. These
sources may continue to operate even after the
controller is placed in a power-managed mode.
The PIC18F2221/2321/4221/4321 family of devices
offers the Timer1 oscillator as a secondary oscillator.
This oscillator, in all power-managed modes, is often
the time base for functions such as a Real-Time Clock.
Most often, a 32.768 kHz watch crystal is connected
between the RC0/T1OSO/T13CKI and RC1/T1OSI
pins. Like the LP mode oscillator circuit, loading
capacitors are also connected from each pin to ground.
The Timer1 oscillator is discussed in greater detail in
Section 13.3 “Timer1 Oscillator”.
In addition to being a primary clock source, the internal
oscillator block is available as a power-managed
mode clock source. The INTRC source is also used as
the clock source for several special features, such as
the WDT and Fail-Safe Clock Monitor.
The clock sources for the PIC18F2221/2321/4221/4321
family of devices are shown in Figure 3-11. See
Section 24.0 “Special Features of the CPU” for
Configuration register details.
FIGURE 3-11:
PIC18F2221/2321/4221/4321 FAMILY CLOCK DIAGRAM
4 x PLL
FOSC<3:0>
Secondary Oscillator
T1OSCEN
Enable
Oscillator
T1OSO
T1OSI
Clock Source Option
for Other Modules
OSC1
OSC2
Sleep
HSPLL, INTOSC/PLL
LP, XT, HS, RC, EC
T1OSC
CPU
Peripherals
IDLEN
P
os
tsca
ler
MU
X
MU
X
8 MHz
4 MHz
2 MHz
1 MHz
500 kHz
125 kHz
250 kHz
OSCCON<6:4>
111
110
101
100
011
010
001
000
31 kHz
INTRC
Source
Internal
Oscillator
Block
WDT, PWRT, FSCM
8 MHz
Internal Oscillator
(INTOSC)
OSCCON<6:4>
Clock
Control
OSCCON<1:0>
Source
8 MHz
31 kHz (INTRC)
OSCTUNE<6>
0
1
OSCTUNE<7>
and Two-Speed Start-up
Primary Oscillator
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相关代理商/技术参数
参数描述
PIC18LF4221T-I/ML 功能描述:8位微控制器 -MCU 44 Pin 4 KB FL 512 RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18LF4221T-I/PT 功能描述:8位微控制器 -MCU 4KB FL 512 RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18LF4320-I/ML 功能描述:8位微控制器 -MCU 8KB 512 RAM 36I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18LF4320-I/P 功能描述:8位微控制器 -MCU 8KB 512 RAM 36I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC18LF4320-I/PT 功能描述:8位微控制器 -MCU 8KB 512 RAM 36I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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