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Detect warm/called reset

Ruven H

Hello,
My target is based on AT89C51ED2 and RTX-Tiny.
I'm trying to detect warm/cold reset. I know that POF bit didn't work in the RD2 version, so I don't want to use it here also.
I defined two global variables one in XDATA and the other one in DATA.
I sow that after cold reset (power up) the values are 0xFF for XDATA and 0x0 for DATA. In the program i change those values to 0x55 and cause to warm reset (by watchdog or hardware reset) I think that in this case I need to receive 0x55 but instead I receive 0xFF in XDATA and 0x0 in DATA.
Can you tell me why?

Thanks a lot,
Roberto

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    I sow that after cold reset (power up) the values are 0xFF for XDATA and 0x0 for DATA. In the program i change those values to 0x55 and cause to warm reset (by watchdog or hardware reset) I think that in this case I need to receive 0x55 but instead I receive 0xFF in XDATA and 0x0 in DATA.
    Can you tell me why?
    1) the values after power on reset are indeterminate,thus your method may/will fail.
    2) probably the warm reset result is due to C initializer clearing the DATA and you not having the 'set internal xdata' SFR bit set before the startup clears XDATA.

    Erik