EMI with 8Bit/8Bit?

[thack9]

Posted on November 03, 2006 at 06:19

EMI with 8Bit/8Bit?

[thack9]

Posted on May 17, 2011 at 09:33

Hello!

We would like to use an external UART with an 8Bit data- and an 8Bit addressbus. Is it possible to use the EMI in this way? In the datasheet on pages 31/32 there is a Fig. 5 that looks the right way, but i don't find anything about the usage of port 9 in this configuration. Thanks in advance Thomas

[amira1]

Posted on May 17, 2011 at 09:33

Hi tomte,

if you will use an EMI 8 bit non multiplexed mode you have to configure only port 7 which contain the first eight lines of adress. Best regards mirou

[thack9]

Posted on May 17, 2011 at 09:33

Hi!

The multiplexed mode is O.K. for me. The question is just: can i use the not used (by the UART) address bits (a8..a15) on port 9 for gpio's? Thanks Thomas

[nanuradha]

Posted on May 17, 2011 at 09:33

Hi,

you need not to use address ,data bus to interface with UART.Any port in input/output mode will be sufficient.You can keep port8,9 in gpio mode and u can use the port to interface with uart.

[thack9]

Posted on May 17, 2011 at 09:33

O.K.

Thanks a lot for your help. I will try this. Greetings Thomas

[amira1]

Posted on May 17, 2011 at 09:33

Hi tomte,

please refer to pin description in table4 in the STR9 datasheet. You will see that you can use GPIO9 pins for another function when you configure it in alternate output 1 or its default pin function. Best regards mirou