Keil forum Strange behavior of the Debugger

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Strange behavior of the Debugger

Andrew Kan over 22 years ago

I have seen a strange behavior of Keil Debugger: when I try to step through

mov A,SBUF

previously setting SBUF with some value in Watch Window I don't see this value in A after step. Is this a problem or I doing something wrong?

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0 John Donaldson over 22 years ago in reply to Andrew Kan

SBUF is really two separate registers, you get the contents of the receive register when you read SBUF, however when you write to SBUF the value goes into the transmit register. In a nutshell you cannot read back what you have written.

Stefan
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0 John Donaldson over 22 years ago in reply to Andrew Kan

SBUF is really two separate registers, you get the contents of the receive register when you read SBUF, however when you write to SBUF the value goes into the transmit register. In a nutshell you cannot read back what you have written.

Stefan
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