Renesas Technology, Tools FAQs
Last Updated: October 7, 2002
Document Number: 02092001_e
Q.
I modified the setting of the port P9 direction register in my program, but the setting doesn't change. What's the problem?
A.
The protect register (PRC2) needs to be set as well.
However, after the protect register is set, it will clear to "0" when you write to any address. Therefore, make sure you
reprogram the port P9 direction register immediately after you set the protect register.
Make sure a write cycle due to an interrupt, DMA transfer, etc. hasn't occurred between the time the protect register is set and
the port P9 direction register is reprogrammed. To do so, confirm the bus mode display in the trace window.
1.
Make sure the port P92 is functioning as a port and not as a peripheral function.2.
For more information on using debug software, please refer to related FAQs on this homepage.3.
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