參數(shù)資料
    

    


    


    
型號(hào)：
PSD9343V15JIT

    

    
廠商：
意法半導(dǎo)體

    

    
英文描述：
Flash In-System Programmable ISP Peripherals For 8-bit MCUs

    

    
中文描述：
Flash在系統(tǒng)可編程ISP的外設(shè)的8位微控制器

    

    
文件頁(yè)數(shù)：
26/110頁(yè)

    

    
文件大?。?/td>
1737K

    

    
代理商：
PSD9343V15JIT


    

    

    

	
    
    
    

    
    
	
    PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2
    26/110
    Data Toggle
    Checking the Toggle Flag Bit (DQ6) is a method of
    determining whether a Program or Erase cycle is
    in progress or has completed. Figure 
    8
     shows the
    Data Toggle algorithm.
    When the MCU issues a Program instruction, the
    embedded algorithm within the PSD begins. The
    MCU then reads the location of the byte to be pro-
    grammed in Flash memory to check status. The
    Toggle Flag Bit (DQ6) of this location toggles each
    time the MCU reads this location until the embed-
    ded algorithm is complete. The MCU continues to
    read this location, checking the Toggle Flag Bit
    (DQ6) and monitoring the Error Flag Bit (DQ5).
    When the Toggle Flag Bit (DQ6) stops toggling
    (two consecutive reads yield the same value), and
    the Error Flag Bit (DQ5) remains ’0,’ the embed-
    ded algorithm is complete. If the Error Flag Bit
    (DQ5) is '1,' the MCU should test the Toggle Flag
    Bit (DQ6) again, since the Toggle Flag Bit (DQ6)
    may have changed simultaneously with the Error
    Flag Bit (DQ5, see Figure 
    8
    ).
    The Error Flag Bit (DQ5) is set if either an internal
    time-out occurred while the embedded algorithm
    attempted to program the byte, or if the MCU at-
    tempted to program a '1' to a bit that was not
    erased (not erased is logic '0').
    It is suggested (as with all Flash memories) to read
    the location again after the embedded program-
    ming algorithm has completed, to compare the
    byte that was written to Flash memory with the
    byte that was intended to be written.
    When using the Data Toggle method after an
    Erase cycle, Figure 
    8
     still applies. the Toggle Flag
    Bit (DQ6) toggles until the Erase cycle is complete.
    A '1' on the Error Flag Bit (DQ5) indicates a time-
    out condition on the Erase cycle; a '0' indicates no
    error. The MCU can read any location within the
    sector being erased to get the Toggle Flag Bit
    (DQ6) and the Error Flag Bit (DQ5).
    PSDsoft Express generates ANSI C code func-
    tions which implement these Data Toggling algo-
    rithms.
    Unlock Bypass (PSD833F2x, PSD834F2x, 
    PSD853F2x, PSD854F2x)
    The Unlock Bypass instructions allow the system
    to program bytes to the Flash memories faster
    than using the standard Program instruction. The
    Unlock Bypass mode is entered by first initiating
    two Unlock cycles. This is followed by a third
    WRITE cycle containing the Unlock Bypass code,
    20h (as shown in 
    Table 9., page 21
    ).
    The Flash memory then enters the Unlock Bypass
    mode. A two-cycle Unlock Bypass Program in-
    struction is all that is required to program in this
    mode. The first cycle in this instruction contains
    the Unlock Bypass Program code, A0h. The sec-
    ond cycle contains the program address and data.
    Additional data is programmed in the same man-
    ner. These instructions dispense with the initial
    two Unlock cycles required in the standard Pro-
    gram instruction, resulting in faster total Flash
    memory programming.
    During the Unlock Bypass mode, only the Unlock
    Bypass Program and Unlock Bypass Reset Flash
    instructions are valid.
    To exit the Unlock Bypass mode, the system must
    issue the two-cycle Unlock Bypass Reset Flash in-
    struction. The first cycle must contain the data
    90h; the second cycle the data 00h. Addresses are
    Don’t Care for both cycles. The Flash memory
    then returns to READ Mode.
    Figure 8. Data Toggle Flowchart
    READ
    DQ5 & DQ6
    START
    READ DQ6
    FAIL
    PASS
    AI01370B
    D=
    TOGGLE
    NO
    NO
    YES
    YES
    DQ5
    = 1
    NO
    YES
    D=
    TOGGLE
    
    
    
    
    
    


    


    

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PSD934F290J
 制造商:WSI 功能描述:

    

    
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PSD934F2-90M
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PSD934F2V-15J
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