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    參數(shù)資料
    

    


    


    
型號(hào)：
P87LPC764

    

    
廠(chǎng)商：
NXP Semiconductors N.V.

    

    
英文描述：
Low power, low price, low pin count(20 pin) microcontroller with4 kB OTP(帶4 kB OTP的低功耗，低價(jià)格，少引腳（20引腳）的微控制器)

    

    
中文描述：
低功耗，低價(jià)格，低引腳數(shù)（20針）微控制器with4 kB檢察官辦公室（帶4 KB的檢察官辦公室的低功耗，低價(jià)格，少引腳（20引腳）的微控制器）

    

    
文件頁(yè)數(shù)：
11/55頁(yè)

    

    
文件大小：
274K

    

    
代理商：
P87LPC764


    

    

    

	
    
    
    

    
    
	
    Philips Semiconductors
    Preliminary specification
    87LPC764
    Low power, low price, low pin count (20 pin)
    microcontroller with 4 kB OTP
    2000 Jun 01
    8
    FUNCTIONAL DESCRIPTION
    Details of 87LPC764 functions will be described in the following
    sections.
    Enhanced CPU
    The 87LPC764 uses an enhanced 80C51 CPU which runs at twice the
    speed of standard 80C51 devices. This means that the performance of
    the 87LPC764 running at 5 MHz is exactly the same as that of a
    standard 80C51 running at 10 MHz. A machine cycle consists of 6
    oscillator cycles, and most instructions execute in 6 or 12 clocks. A
    user configurable option allows restoring standard 80C51 execution
    timing. In that case, a machine cycle becomes 12 oscillator cycles.
    In the following sections, the term “CPU clock” is used to refer to the
    clock that controls internal instruction execution. This may
    sometimes be different from the externally applied clock, as in the
    case where the part is configured for standard 80C51 timing by
    means of the CLKR configuration bit or in the case where the clock
    is divided down via the setting of the DIVM register. These features
    are described in the Oscillator section.
    Analog Functions
    The 87LPC764 incorporates two Analog Comparators. In order to
    give the best analog function performance and to minimize power
    consumption, pins that are actually being used for analog functions
    must have the digital outputs and the digital inputs disabled.
    Digital outputs are disabled by putting the port output into the Input
    Only (high impedance) mode as described in the I/O Ports section.
    Digital inputs on port 0 may be disabled through the use of the
    PT0AD register. Each bit in this register corresponds to one pin of
    Port 0. Setting the corresponding bit in PT0AD disables that pin’s
    digital input. Port bits that have their digital inputs disabled will be
    read as 0 by any instruction that accesses the port.
    Analog Comparators
    Two analog comparators are provided on the 87LPC764. Input and
    output options allow use of the comparators in a number of different
    configurations. Comparator operation is such that the output is a
    logical one (which may be read in a register and/or routed to a pin)
    when the positive input (one of two selectable pins) is greater than
    the negative input (selectable from a pin or an internal reference
    voltage). Otherwise the output is a zero. Each comparator may be
    configured to cause an interrupt when the output value changes.
    Comparator Configuration
    Each comparator has a control register, CMP1 for comparator 1 and
    CMP2 for comparator 2. The control registers are identical and are
    shown in Figure 2.
    The overall connections to both comparators are shown in Figure 3.
    There are eight possible configurations for each comparator, as
    determined by the control bits in the corresponding CMPn register:
    CPn, CNn, and OEn. These configurations are shown in Figure 4.
    The comparators function down to a V
    DD
     of 3.0V.
    When each comparator is first enabled, the comparator output and
    interrupt flag are not guaranteed to be stable for 10 microseconds.
    The corresponding comparator interrupt should not be enabled
    during that time, and the comparator interrupt flag must be cleared
    before the interrupt is enabled in order to prevent an immediate
    interrupt service.
    BIT
    CMPn.7, 6
    CMPn.5
    SYMBOL
    —
    CEn
    FUNCTION
    Reserved for future use. Should not be set to 1 by user programs.
    Comparator enable. When set by software, the corresponding comparator function is enabled.
    Comparator output is stable 10 microseconds after CEn is first set.
    Comparator positive input select. When 0, CINnA is selected as the positive comparator input. When
    1, CINnB is selected as the positive comparator input.
    Comparator negative input select. When 0, the comparator reference pin CMPREF is selected as
    the negative comparator input. When 1, the internal comparator reference V
    ref
     is selected as the
    negative comparator input.
    Output enable. When 1, the comparator output is connected to the CMPn pin if the comparator is
    enabled (CEn = 1). This output is asynchronous to the CPU clock.
    Comparator output, synchronized to the CPU clock to allow reading by software. Cleared when the
    comparator is disabled (CEn = 0).
    Comparator interrupt flag. This bit is set by hardware whenever the comparator output COn changes
    state. This bit will cause a hardware interrupt if enabled and of sufficient priority. Cleared by
    software and when the comparator is disabled (CEn = 0).
    CMPn.4
    CPn
    CMPn.3
    CNn
    CMPn.2
    OEn
    CMPn.1
    COn
    CMPn.0
    CMFn
    CMFn
    SU01152
    COn
    OEn
    CNn
    CPn
    CEn
    —
    —
    0
    1
    2
    3
    4
    5
    6
    7
    CMPn
    Reset Value: 00h
    Not Bit Addressable
    Address: ACh for CMP1, ADh for CMP2
    Figure 2.  Comparator Control Registers (CMP1 and CMP2)
    
    
    
    
    
    


    


    

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    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
P87LPC764BD
 制造商:PHILIPS-SEMI 功能描述:

    

    
P87LPC764BD,512
功能描述:8位微控制器 -MCU 80C51 4K/128 OTP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT

    

    
P87LPC764BD/01
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P87LPC764BD/01,529
功能描述:8位微控制器 -MCU 4K/128 OTP 2.7-6V LO PWR SO20 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT

    

    
P87LPC764BD/CP3220
 制造商:NXP Semiconductors 功能描述:- Rail/Tube

    

    
    
    
    
	
    	
    
    
     
     
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