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      1. 參數(shù)資料
        型號(hào): XE8805AMI028LF
        廠商: Semtech
        文件頁(yè)數(shù): 68/156頁(yè)
        文件大?。?/td> 0K
        描述: IC DAS 16BIT FLASH 8K MTP 64LQFP
        標(biāo)準(zhǔn)包裝: 160
        系列: XE880x
        應(yīng)用: 感測(cè)機(jī)
        核心處理器: Coolrisc816?
        程序存儲(chǔ)器類(lèi)型: 閃存(22 kB)
        控制器系列: XE8000
        RAM 容量: 512 x 8
        接口: UART,USRT
        輸入/輸出數(shù): 24
        電源電壓: 2.4 V ~ 5.5 V
        工作溫度: -40°C ~ 85°C
        安裝類(lèi)型: 表面貼裝
        封裝/外殼: 64-LQFP
        包裝: 托盤(pán)
        供應(yīng)商設(shè)備封裝: 64-LQFP(10x10)
        產(chǎn)品目錄頁(yè)面: 585 (CN2011-ZH PDF)
        配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
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        Semtech 2006
        www.semtech.com
        3-2
        XE8805/05A
        3.1
        CPU description
        The CPU of the XE8000 series is a low power RISC core. It has 16 internal registers for efficient implementation of
        the C compiler. Its instruction set is made up of 35 generic instructions, all coded on 22 bits, with 8 addressing
        modes. All instructions are executed in one clock cycle, including conditional jumps and 8x8 multiplication. The
        circuit therefore runs on 1 MIPS on a 1MHz clock.
        The CPU hardware and software description is given in the document “Coolrisc816 Hardware and Software
        Reference Manual”. A short summary is given in the following paragraphs.
        The
        good
        code
        efficiency
        of
        the
        CPU
        core
        makes
        it
        possible
        to
        compute
        a
        polynomial
        like
        Y
        B
        X
        Y
        A
        Z
        +
        +
        =
        1
        0
        1
        0
        )
        (
        in less than 300 clock cycles (software code generated by the XEMICS C-
        compiler, all numbers are signed integers on 16 bits).
        3.2
        CPU internal registers
        As shown in Figure 3-1, the CPU has 16 internal 8-bit registers. Some of these registers can be concatenated to a
        16-bit word for use in some instructions. The function of these registers is defined in Table 3-1. The status register
        stat (Table 3-2) is used to manage the different interrupt and event levels. An interrupt or an event can both be
        used to wake up after a HALT instruction. The difference is that an interrupt jumps to a special interrupt function
        whereas an event continues the software execution with the instruction following the HALT instruction.
        The program counter (PC) is a 16 bit register that indicates the address of the instruction that has to be executed.
        The stack (STn) is used to memorise the return address when executing subroutines or interrupt routines.
        Instruction
        memory
        22bit
        CPU
        in
        tern
        al
        r
        egister
        s
        a
        stat
        iph
        ipl
        i3h
        i3l
        i2h
        i2l
        i1h
        i1l
        i0h
        i0l
        r3
        r2
        r1
        r0
        Data memory
        da
        ta
        b
        us
        in
        stru
        ction
        b
        u
        s
        PC
        ST
        1
        ST
        2
        ST
        3
        ST
        4
        program counter stack
        Figure 3-1. CPU internal registers
        Not
        Recommended
        for
        New
        Designs
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        XE8805AMI028TLF 制造商:Semtech Corporation 功能描述:
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