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    參數資料
    

    


    


    
型號：
PIC18F252-I/SP

    

    
廠商：
Microchip Technology

    

    
文件頁數：
6/134頁

    

    
文件大小：
0K

    

    
描述：
IC MCU FLASH 16KX16 EE 28DIP

    

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

    

    
標準包裝：
15

    

    
系列：
PIC® 18F

    

    
核心處理器：
PIC
    		

    

    
芯體尺寸：
8-位
    		

    

    
速度：
40MHz
    		

    

    
連通性：
I²C，SPI，UART/USART
    		

    

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

    

    
輸入/輸出數：
23
    		

    

    
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)：
4.2 V ~ 5.5 V
    		

    

    
數據轉換器：
A/D 5x10b
    		

    

    
振蕩器型：
外部
    		

    

    
工作溫度：
-40°C ~ 85°C
    		

    

    
封裝/外殼：
28-DIP（0.300"，7.62mm）
    		

    

    
包裝：
管件
    		

    

    
其它名稱：
PIC18F252-I/SPG
    PIC18F252-I/SPG-ND
    PIC18F252I/SP
    		

    

    

    

	
    
    
    

    
    
	
     1997 Microchip Technology Inc.
    DS30444E - page 103
    PIC16C9XX
    14.0
    SPECIAL FEATURES OF THE
    CPU
    What sets a microcontroller apart from other proces-
    sors are special circuits to deal with the needs of
    real-time applications. The PIC16CXXX family has a
    host of such features intended to maximize system reli-
    ability, minimize cost through elimination of external
    components, provide power saving operating modes
    and offer code protection. These are:
     Oscillator selection
     Reset
    - Power-on Reset (POR)
    - Power-up Timer (PWRT)
    - Oscillator Start-up Timer (OST)
     Interrupts
     Watchdog Timer (WDT)
     SLEEP
     Code protection
     ID locations
     In-circuit serial programming
    The PIC16CXXX has a Watchdog Timer which can be
    shut off only through conguration bits. It runs off its
    own RC oscillator for added reliability. There are two
    timers that offer necessary delays on power-up. One is
    the Oscillator Start-up Timer (OST), intended to keep
    the chip in reset until the crystal oscillator is stable. The
    other is the Power-up Timer (PWRT), which provides a
    xed delay of 72 ms (nominal) on power-up only,
    designed to keep the part in reset while the power sup-
    ply stabilizes. With these two timers on-chip, most
    applications need no external reset circuitry.
    SLEEP mode is designed to offer a very low current
    power-down mode. The user can wake-up from SLEEP
    through external reset, Watchdog Timer Wake-up or
    through an interrupt. Several oscillator options are also
    made available to allow the part to t the application.
    The RC oscillator option saves system cost while the
    LP crystal option saves power. A set of conguration
    bits are used to select various options.
    14.1
    Conguration Bits
    The conguration bits can be programmed (read as '0')
    or left unprogrammed (read as '1') to select various
    device congurations. These bits are mapped in pro-
    gram memory location 2007h.
    The user will note that address 2007h is beyond the
    user program memory space. In fact, it belongs to the
    special test/conguration memory space (2000h -
    3FFFh), which can be accessed only during program-
    ming.
    FIGURE 14-1: CONFIGURATION WORD
    CP1
    CP0
    CP1
    CP0
    CP1
    CP0
    —
    CP1
    CP0
    PWRTE WDTE FOSC1 FOSC0
    Register:
    CONFIG
    Address
    2007h
    bit13
    bit0
    bit 13-8 CP1:CP0 Code protection bits (1)
    5-4: 11 = Code protection off
    10 = Upper half of program memory code protected
    01 = Upper 3/4 of program memory code protected
    00 = All memory is code protected
    bit 6:
    Unimplemented: Read as '1'
    bit 3:
    PWRTE: Power-up Timer Enable bit
    1 = PWRT disabled
    0 = PWRT enabled
    bit 2:
    WDTE: Watchdog Timer Enable bit
    1 = WDT enabled
    0 = WDT disabled
    bit 1-0:
    FOSC1:FOSC0: Oscillator Selection bits
    11
    = RC oscillator
    10
    = HS oscillator
    01
    = XT oscillator
    00
    = LP oscillator
    Note
    1: All of the CP1:CP0 bits have to be given the same value to enable the code protection scheme listed.
    
    
    
    
    
    


    


    

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PIC18F252T-E/SO
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PIC18F252T-I/SO
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PIC18F2539-E/SP
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