• 參數(shù)資料
    型號: TMX320LF2402APGA
    英文描述: DSP|16-BIT|CMOS|QFP|64PIN|PLASTIC
    中文描述: 數(shù)字信號處理器| 16位|的CMOS | QFP封裝| 64管腳|塑料
    文件頁數(shù): 45/132頁
    文件大?。?/td> 1707K
    代理商: TMX320LF2402APGA
    SPRS145G
    JULY 2000
    REVISED FEBRUARY 2002
    45
    POST OFFICE BOX 1443
    HOUSTON, TEXAS 77251
    1443
    ROM
    The LC240xA devices contain mask-programmable ROM located in program memory space. Customers can
    arrange to have this ROM programmed with contents unique to any particular application. See Table 1 for the
    ROM memory capacity of each LC240xA device.
    boot ROM (LF240xA only)
    Boot ROM is a 256-word ROM memory-mapped in program space 0000
    00FF. This ROM will be enabled if the
    BOOT_EN pin is low during reset. The BOOT_EN bit (bit 3 of the SCSR2 register) will be set to 0 if the BOOT_EN
    pin is low at reset. Boot ROM can also be enabled by writing 0 to the SCSR2.3 bit and disabled by writing 1 to
    this bit.
    The boot ROM has a generic bootloader to transfer code through SCI or SPI ports. The incoming code should
    disable the BOOT_ROM bit by writing 1 to bit 3 of the SCSR2 register, or else, the whole Flash array will not
    be enabled.
    The boot ROM code sets the PLL to x2 or x4 option based on the condition of the SCITXD pin during reset. The
    SCITXD pin should be pulled high/low to select the PLL multiplication factor. The choices made are as follows:
    If the SCITXD pin is pulled low, the PLL multiplier is set to 2.
    If the SCITXD pin is pulled high, the PLL multiplier is set to 4. (Default)
    If the SCITXD pin is not driven at reset, the internal pullup selects the default multiplier of 4.
    Care should be taken such that a combination of CLKIN and the PLL multiplication factor should not result in
    a CPU clock speed of greater than 40 MHz, the maximum rated speed.
    Furthermore, when the bootloader is used, only specific values of CLKIN would result in a baud-lock for the SCI.
    Refer to the
    TMS320LF/LC240xA DSP Controllers Reference Guide: System and Peripherals
    (literature
    number SPRU357) for more details about the bootloader operation.
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