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    參數資料
    

    


    


    
型號：
PIC18LF45K22-I/ML

    

    
廠商：
Microchip Technology

    

    
文件頁數：
32/71頁

    

    
文件大?。?/td>
0K

    

    
描述：
MCU 8BIT 32KB FLASH 3.6V 44QFN

    

    
產品培訓模塊：
8-bit PIC® Microcontroller Portfolio
    		

    

    
標準包裝：
45

    

    
系列：
PIC® XLP™ 18F

    

    
核心處理器：
PIC
    		

    

    
芯體尺寸：
8-位
    		

    

    
速度：
64MHz
    		

    

    
連通性：
I²C，SPI，UART/USART
    		

    

    
外圍設備：
欠壓檢測/復位，HLVD，POR，PWM，WDT
    		

    

    
輸入/輸出數：
35
    		

    

    
程序存儲器容量：
32KB（16K x 16）
    		

    

    
程序存儲器類型：
閃存
    		

    

    
EEPROM 大?。?/td>
256 x 8
    		

    

    
RAM 容量：
1.5K x 8
    		

    

    
電壓 - 電源 (Vcc/Vdd)：
1.8 V ~ 3.6 V
    		

    

    
數據轉換器：
A/D 30x10b
    		

    

    
振蕩器型：
內部
    		

    

    
工作溫度：
-40°C ~ 85°C
    		

    

    
封裝/外殼：
44-VQFN 裸露焊盤
    		

    

    
包裝：
管件
    		

    

    
產品目錄頁面：
656 (CN2011-ZH PDF)
    		

    

    

    

	
    
    
    

    
    
	
    PIC18(L)F2X/4XK22
    DS41412E-page 38
     2010-2012 Microchip Technology Inc.
    2.7.1
    LFINTOSC
    The Low-Frequency Internal Oscillator (LFINTOSC) is
    a 31.25 kHz internal clock source. The LFINTOSC is
    not tunable, but is designed to be stable across temper-
    ature and voltage. See Section 27.0 “Electrical Char-
    for
    the
    LFINTOSC
    accuracy
    specifications.
    The output of the LFINTOSC can be a clock source to
    the primary clock or the INTOSC clock (see Figure 2-1).
    The LFINTOSC is also the clock source for the Power-
    up Timer (PWRT), Watchdog Timer (WDT) and Fail-Safe
    Clock Monitor (FSCM).
    2.7.2
    FREQUENCY SELECT BITS (IRCF)
    The HFINTOSC (16 MHz) and MFINTOSC (500 MHz)
    outputs connect to a divide circuit that provides
    frequencies of 16 MHz to 31.25 kHz. These divide
    circuit
    frequencies,
    along
    with
    the
    31.25 kHz
    LFINTOSC output, are multiplexed to provide a single
    INTOSC clock output (see Figure 2-1). The IRCF<2:0>
    bits of the OSCCON register, the MFIOSEL bit of the
    OSCCON2 register and the INTSRC bit of the
    OSCTUNE register, select the output frequency of the
    internal oscillators. One of eight frequencies can be
    selected via software:
    16 MHz
    8 MHz
    4 MHz
    2 MHz
     1 MHz (default after Reset)
     500 kHz (MFINTOSC or HFINTOSC)
     250 kHz (MFINTOSC or HFINTOSC)
     31 kHz (LFINTOSC, MFINTOSC or HFINTOSC)
    2.7.3
    INTOSC FREQUENCY DRIFT
    The factory calibrates the internal oscillator block outputs
    (HFINTOSC/MFINTOSC) for 16 MHz/500 kHz. However,
    this frequency may drift as VDD or temperature changes.
    It is possible to adjust the HFINTOSC/MFINTOSC fre-
    quency by modifying the value of the TUN<5:0> bits in the
    OSCTUNE register. This has no effect on the LFINTOSC
    clock source frequency.
    Tuning the HFINTOSC/MFINTOSC source requires
    knowing when to make the adjustment, in which direc-
    tion it should be made and, in some cases, how large a
    change is needed. Three possible compensation tech-
    niques are discussed in the following sections. However,
    other techniques may be used.
    2.7.3.1
    Compensating with the EUSART
    An adjustment may be required when the EUSART
    begins to generate framing errors or receives data with
    errors while in Asynchronous mode. Framing errors
    indicate that the device clock frequency is too high; to
    adjust for this, decrement the value in OSCTUNE to
    reduce the clock frequency. On the other hand, errors
    in data may suggest that the clock speed is too low; to
    compensate, increment OSCTUNE to increase the
    clock frequency.
    2.7.3.2
    Compensating with the Timers
    This technique compares device clock speed to some
    reference clock. Two timers may be used; one timer is
    clocked by the peripheral clock, while the other is
    clocked by a fixed reference source, such as the
    Timer1 oscillator.
    Both timers are cleared, but the timer clocked by the
    reference generates interrupts. When an interrupt
    occurs, the internally clocked timer is read and both
    timers are cleared. If the internally clocked timer value
    is greater than expected, then the internal oscillator
    block is running too fast. To adjust for this, decrement
    the OSCTUNE register.
    2.7.3.3
    Compensating with the CCP Module
    in Capture Mode
    A CCP module can use free running Timer1, Timer3 or
    Timer5 clocked by the internal oscillator block and an
    external event with a known period (i.e., AC power
    frequency). The time of the first event is captured in the
    CCPRxH:CCPRxL registers and is recorded for use later.
    When the second event causes a capture, the time of the
    first event is subtracted from the time of the second
    event. Since the period of the external event is known,
    the time difference between events can be calculated.
    If the measured time is much greater than the calcu-
    lated time, the internal oscillator block is running too
    fast; to compensate, decrement the OSCTUNE register.
    If the measured time is much less than the calculated
    time, the internal oscillator block is running too slow; to
    compensate, increment the OSCTUNE register.
    
    
    
    
    
    


    


    

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PIC18LF45K22T-I/ML
功能描述:8位微控制器 -MCU 32KB Flash 1536B RAM 8B nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT

    

    
PIC18LF45K22T-I/MV
功能描述:8位微控制器 -MCU 32KB 1536b RAM 8bit familynanoWatt XLP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT

    

    
PIC18LF45K22T-I/PT
功能描述:8位微控制器 -MCU 32KB Flash 1536B RAM 8B nanoWatt RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT

    

    
PIC18LF45K50-E/MV
 制造商:Microchip Technology Inc 功能描述:32 KB FLASH, 2048 BYTES RAM, 4 制造商:Microchip Technology Inc 功能描述:32 KB FLASH, 2048 BYTES RAM, 48 MHZ INT. OSC, 36 I/0, PIC18 - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 32KB FLASH 40UQFN

    

    
PIC18LF45K50-E/P
 制造商:Microchip Technology Inc 功能描述:32 KB FLASH, 2048 BYTES RAM, 48 MHZ INT. OSC, 36 I/0, PIC18 - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 32KB FLASH 40PDIP

    

    
    
    
    
	
    	
    
    
     
     
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