how to use 80390 MDU?

In Keil IDE , i open arithmatic accelerator. But when I compile it. Will display this message. I seem that need some lib. How can I do? *** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL...
how to use 80390 MDU?

In Keil IDE , i open arithmatic accelerator. But when I compile it. Will display this message. I seem that need some lib. How can I do? *** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL...
How to avoid DCD?

I'm sorry. I don't know why it happened, but... the previous post was deleted. Ask the question again. //--------------------------------------------------------------------------------------------...
How to avoid DCD?

I'm sorry. I don't know why it happened, but... the previous post was deleted. Ask the question again. //--------------------------------------------------------------------------------------------...
modem status interrupt on DCD pin

Hi All, I need to generate an interrupt on DCD pin . How can I do this for null modem ? I shorted pins 1, 4 and 6 of the port and trying to toggle bit 0 in MCR register and enabled bit 3 in IER...