Keil forum A question about UV3 debug.

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A question about UV3 debug.

Nantian Gumo over 20 years ago

When c8051f02x 's I/O ports is configured to opendrain ,can see the outputting value in the peripherals I/O_ports when debugging?

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0 Nantian Gumo over 20 years ago in reply to Al Bradford
sorry,I didn't descript the question clearly.
When running the command :

P7 = 0X55;

The peripherals I/O port7 display well .The question is ,can it display when running the command :

XBYTE[0X8000] = 0X55;//EMIF is configure to P4~P7

Thanks all !
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0 Nantian Gumo over 20 years ago in reply to Al Bradford
sorry,I didn't descript the question clearly.
When running the command :

P7 = 0X55;

The peripherals I/O port7 display well .The question is ,can it display when running the command :

XBYTE[0X8000] = 0X55;//EMIF is configure to P4~P7

Thanks all !
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0 Bradford Al over 20 years ago in reply to Nantian Gumo

I believe you are missing some info about SFR ports. Port 7 is SFR 0x96 which can only be accessed via a direct instruction. The XBYTE macro is used to address XDATA memory via a pointer.
There is no indirect access to the SFR memory area.
Suggest that you review memory areas idata,data, code and SFR for more info.
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0 erik malund over 20 years ago in reply to Nantian Gumo

The question is ,can it display when running the command :

XBYTE[0X8000] = 0X55;//EMIF is configure to P4~P7
I guess you are asking:
"can I see the data being written to 0x8000 in P7, the answer is no. See "the bible" chapter 3.

Erik
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