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About 6657 upp

xiang_li
Intellectual 935 points

Hi all,

I want to know something about UPP DATA PIN on 6657.

As UG said,

Signal                  I/O Channel                     (Transmit)                          (Receive)                       Description
DATA[15:0]               —                                    Output                                  Input                        Parallel data bus
XDATA[15:0]             —                                    Output                                  Input                   Extended parallel data bus

But why they are called "DATA" and  "XDATA"? It make me confuse....

Best Regards,

Li

  • 0
    Intellectual 935 points

    Hi all,

    I know the reason,

    We can`t said who own the DATA pin.

    As UG said, 

    Note that the DATA and XDATA pins are not dedicated to a single I/O channel in the
    same way as the control signals. For practical reasons, uPP data pin channel
    assignments are not static. Instead, the data pins used by each I/O channel (A, B)
    depend on the operating mode of the uPP peripheral.
    Table 2-3 summarizes the assignment of the DATA and XDATA pins to each channel
    for various operating modes, along with the relevant register settings. For more
    information on these pins, see the device-specific data manual.