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Problem with WIU in STR9

E. U.

Hello;

First of all, sorry because my English is quite bad.

I have a problem with WIU in STR9 micro. I need to connect a four keys keyboard to P7.4-P7.7 pins. I think that the best form to design this is to "connect" each key with one external interrupt.

The problem is that those WIU lines (26 to 29) go to the same VIC Input Channel (VIC1.13). But I only can recognize one of the keys. I donÂ't know how to "multiplex" the four WIU lines to the same VIC Channel.

¿How can I solve this problem? ¿How can I recognize which of the 4 keys I have pressed?

Thanks in advance.

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