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    參數(shù)資料
    型號: PIC24F16KL401-I/SS
    廠商: Microchip Technology
    文件頁數(shù): 199/260頁
    文件大?。?/td> 0K
    描述: IC MCU 16BIT 16KB FLASH 20-SSOP
    產(chǎn)品培訓(xùn)模塊: Low Cost PIC24F KL Family Overview
    特色產(chǎn)品: PIC24F "KL" Series MCUs
    標(biāo)準(zhǔn)包裝: 67
    系列: PIC® XLP™ 24F
    核心處理器: PIC
    芯體尺寸: 16-位
    速度: 32MHz
    連通性: I²C,IrDA,LIN,SPI,UART/USART
    外圍設(shè)備: 欠壓檢測/復(fù)位,HLVD,POR,PWM,WDT
    輸入/輸出數(shù): 18
    程序存儲器容量: 16KB(5.5K x 24)
    程序存儲器類型: 閃存
    EEPROM 大小: 512 x 8
    RAM 容量: 1K x 8
    電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 12x10b
    振蕩器型: 內(nèi)部
    工作溫度: -40°C ~ 85°C
    封裝/外殼: 20-SSOP(0.209",5.30mm 寬)
    包裝: 管件
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    PIC24F16KL402 FAMILY
    DS31037B-page 43
    2011 Microchip Technology Inc.
    4.2.5
    SOFTWARE STACK
    In addition to its use as a working register, the W15
    register in PIC24F devices is also used as a Software
    Stack Pointer. The pointer always points to the first
    available free word and grows from lower to higher
    addresses. It predecrements for stack pops and
    post-increments for stack pushes, as shown in
    Note that for a PC push during any CALL instruction,
    the MSB of the PC is zero-extended before the push,
    ensuring that the MSB is always clear.
    The Stack Pointer Limit Value (SPLIM) register,
    associated with the Stack Pointer, sets an upper
    address boundary for the stack. SPLIM is uninitialized
    at Reset. As is the case for the Stack Pointer,
    SPLIM<0> is forced to ‘0’ as all stack operations must
    be word-aligned. Whenever an EA is generated, using
    W15 as a source or destination pointer, the resulting
    address is compared with the value in SPLIM. If the
    contents of the Stack Pointer (W15) and the SPLIM
    register are equal, and a push operation is performed,
    a stack error trap will not occur. The stack error trap will
    occur on a subsequent push operation.
    Thus, for example, if it is desirable to cause a stack
    error trap when the stack grows beyond address,
    0DF6, in RAM, initialize the SPLIM with the value,
    0DF4.
    Similarly, a Stack Pointer underflow (stack error) trap is
    generated when the Stack Pointer address is found to
    be less than 0800h. This prevents the stack from
    interfering with the Special Function Register (SFR)
    space.
    FIGURE 4-4:
    CALL
    STACK FRAME
    4.3
    Interfacing Program and Data
    Memory Spaces
    The PIC24F architecture uses a 24-bit wide program
    space and 16-bit wide data space. The architecture is
    also a modified Harvard scheme, meaning that data
    can also be present in the program space. To use this
    data successfully, it must be accessed in a way that
    preserves the alignment of information in both spaces.
    Apart from the normal execution, the PIC24F
    architecture provides two methods by which the
    program space can be accessed during operation:
    Using table instructions to access individual bytes
    or words anywhere in the program space
    Remapping a portion of the program space into
    the data space, PSV
    Table instructions allow an application to read or write
    small areas of the program memory. This makes the
    method ideal for accessing data tables that need to be
    updated from time to time. It also allows access to all
    bytes of the program word. The remapping method
    allows an application to access a large block of data on
    a read-only basis, which is ideal for look-ups from a
    large table of static data. It can only access the least
    significant word (lsw) of the program word.
    4.3.1
    ADDRESSING PROGRAM SPACE
    Since the address ranges for the data and program
    spaces are 16 and 24 bits, respectively, a method is
    needed to create a 23-bit or 24-bit program address
    from 16-bit data registers. The solution depends on the
    interface method to be used.
    For table operations, the 8-bit Table Memory Page
    Address register (TBLPAG) is used to define a 32K word
    region within the program space. This is concatenated
    with a 16-bit EA to arrive at a full 24-bit program space
    address. In this format, the Most Significant bit (MSb) of
    TBLPAG is used to determine if the operation occurs in
    the user memory (TBLPAG<7> = 0) or the configuration
    memory (TBLPAG<7> = 1).
    For remapping operations, the 8-bit Program Space
    Visibility Page Address register (PSVPAG) is used to
    define a 16K word page in the program space. When
    the MSb of the EA is ‘1’, PSVPAG is concatenated with
    the lower 15 bits of the EA to form a 23-bit program
    space address. Unlike the table operations, this limits
    remapping operations strictly to the user memory area.
    Table 4-20 and Figure 4-5 show how the program EA is
    created for table operations and remapping accesses
    from the data EA. Here, P<23:0> bits refer to a program
    space word, whereas the D<15:0> bits refer to a data
    space word.
    Note:
    A PC push during exception processing
    will concatenate the SRL register to the
    MSB of the PC prior to the push.
    Note:
    A write to the SPLIM register should not
    be immediately followed by an indirect
    read operation using W15.
    <Free Word>
    PC<15:0>
    000000000
    0
    15
    W15 (before CALL)
    W15 (after CALL)
    S
    ta
    ck
    Gr
    ows
    To
    war
    ds
    H
    igh
    er
    A
    ddr
    es
    s
    0000h
    PC<22:16>
    POP
    : [--W15]
    PUSH : [W15++]
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