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w77e58 read or write

chenwensheng chenwensheng

How Can I read/write 1K SRAM on chip with w77e58 in keil c51?

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    The Winbond W77E58 is a derivation of the 80C52. The on chip 1Kbyte is XRAM but must be enabled with the DME0 bit set to 1. This must be set via software. See the on line data sheet in the Keil tool set. On power up reset the bit is cleared. The XRAM will appear as 0x00 -- 0x3FE of xdata. See the C51 manuals for accessing xdata. The WE77E58 is not supported by the Keil ARM tool set but is supported by the PK51 and DK51 tool set.
    Rgds, Bradford

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    The Winbond W77E58 is a derivation of the 80C52. The on chip 1Kbyte is XRAM but must be enabled with the DME0 bit set to 1. This must be set via software. See the on line data sheet in the Keil tool set. On power up reset the bit is cleared. The XRAM will appear as 0x00 -- 0x3FE of xdata. See the C51 manuals for accessing xdata. The WE77E58 is not supported by the Keil ARM tool set but is supported by the PK51 and DK51 tool set.
    Rgds, Bradford

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