100pin device FSMC and Graphic LCD

[dimax]

Posted on November 23, 2012 at 12:12

HI,

I'm I right to assume that in 100pin devices FSMC can be used only in multiplexed mode as Address bus is not available on this chips?

Or one should drive Address lines in FW. So that A0 used as RS signal for Graphic LCD connection should be toggled in FW as regular non alternate function GPIO while rest of the transaction can be done by FSMC?

[waclawek.jan]

Posted on November 23, 2012 at 16:58

If I understand correctly, you need only one arbitrary address line. I'd say you still could use the high (A16 and up) addresses, which are mapped out on the 100-pin packages pins.

JW

[dimax]

Posted on November 23, 2012 at 20:13

Good Idea, did not think about it.

Yes it should be OK in this case and even better then using A0 as in this case I can make 32bit access (that will be spitted into two 16bit transfers or 4 8-bit transfers depending of selected data bus width) without care of A0 get changed.