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参数资料
型号： PIC18LF4221-I/ML
厂商： Microchip Technology
文件页数： 44/110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 39
PIC18F2221/2321/4221/4321 FAMILY
4.0
POWER-MANAGED MODES
PIC18F2221/2321/4221/4321 family devices offer a
total of seven operating modes for more efficient
power-management. These modes provide a variety of
options for selective power conservation in applications
where resources may be limited (i.e., battery-powered
devices).
There are three categories of power-managed modes:
Run modes
Idle modes
Sleep mode
These categories define which portions of the device
are clocked and sometimes, what speed. The Run and
Idle modes may use any of the three available clock
sources (primary, secondary or internal oscillator
block); the Sleep mode does not use a clock source.
The power-managed modes include several power-
saving features offered on previous PIC devices. One
is the clock switching feature, offered in other PIC18
devices, allowing the controller to use the Timer1 oscil-
lator in place of the primary oscillator. Also included is
the Sleep mode, offered by all PIC devices, where all
device clocks are stopped.
4.1
Selecting Power-Managed Modes
Selecting a power-managed mode requires two
decisions: if the CPU is to be clocked or not and the
selection of a clock source. The IDLEN bit
(OSCCON<7>) controls CPU clocking, while the
SCS<1:0 bits (OSCCON<1:0>) select the clock source.
The individual modes, bit settings, clock sources and
affected modules are summarized in Table 4-1.
4.1.1
CLOCK SOURCES
The SCS<1:0 bits allow the selection of one of three
clock sources for power-managed modes. They are:
the primary clock, as defined by the FOSC<3:0>
Configuration bits
the secondary clock (the Timer1 oscillator)
the internal oscillator block (for RC modes)
4.1.2
ENTERING POWER-MANAGED
MODES
Switching from one power-managed mode to another
begins by loading the OSCCON register. The
SCS1:SCS0 bits select the clock source and determine
which Run or Idle mode is to be used. Changing these
bits causes an immediate switch to the new clock
source, assuming that it is running. The switch may
also be subject to clock transition delays. These are
discussed in Section 4.1.3 “Clock Transitions and
Status Indicators” and subsequent sections.
Entry to the power-managed Idle or Sleep modes is
triggered by the execution of a SLEEP instruction. The
actual mode that results depends on the status of the
IDLEN bit.
Depending on the current mode and the mode being
switched to, a change to a power-managed mode does
not always require setting all of these bits. Many
transitions may be done by changing the oscillator select
bits, or changing the IDLEN bit, prior to issuing a SLEEP
instruction. If the IDLEN bit is already configured
correctly, it may only be necessary to perform a SLEEP
instruction to switch to the desired mode.
TABLE 4-1:
POWER-MANAGED MODES
Mode
OSCCON Bits
Module Clocking
Available Clock and Oscillator Source
IDLEN<7>(1) SCS<1:0>
CPU
Peripherals
Sleep
0
N/A
Off
None – All clocks are disabled
PRI_RUN
N/A
00
Clocked
Primary – LP, XT, HS, HSPLL, RC, EC and
Internal Oscillator Block.(2)
This is the normal full power execution mode.
SEC_RUN
N/A
01
Clocked
Secondary – Timer1 Oscillator
RC_RUN
N/A
1x
Clocked
Internal Oscillator Block(2)
PRI_IDLE
100
Off
Clocked
Primary – LP, XT, HS, HSPLL, RC, EC
SEC_IDLE
101
Off
Clocked
Secondary – Timer1 Oscillator
RC_IDLE
11x
Off
Clocked
Internal Oscillator Block(2)
Note 1:
IDLEN reflects its value when the SLEEP instruction is executed.
2:
Includes INTOSC and INTOSC postscaler, as well as the INTRC source.
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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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