Does the STM32F412RGT6 support FSMC?

[AA4]

Currently, I am using the STM32F412RGT6 64-pin package to drive an 8-bit MCU interface screen. However, I am unsure if this MCU supports FSMC.

[mƎALLEm]

Hello,

What stm32f412 datasheet says?:

The answer is yes for UFBGA 100 and LQFP100 packages.

For LQFP64 and WLCSP 64 packages you can use LCD interface for 8-bit data bus.

[waclawek.jan]

“LCD interface” is just ST”s way to tell that you don’t have available the lowermost addresses. “LCD interface” usually uses only one address pin and it does not really matter, which one; it can even be any GPIO (although that’s slightly less convenient to use).

You even *can* use smaller memories or anything interfaced as a memory. What you won’t be able without lower addresses is to write to consecutive bytes/words in the target.

Nevertheless, it’s not just “LCD interface” which is available in the 64-pin packages - multiplexed memories work too (and that can be achieved using a single octal latch for the lowermost addresses). The ‘F407 DS contains a neat table with FSMC pins, pity ST did not care to migrate it to other ‘F4 DS, too.

In other words, in the 64-pin ‘F4xx-s the FSMC *is* available, i.e. it’s not disabled in anyway; it’s just that some of its pins are not available on given package. You have to check yourself, which ones Whether that matters to your application or not, is up to you to judge.

JW

[AA4]

I found an application example in the data sheet of STM32F412RGT6. I followed this example to apply it. Is there any problem with this approach?

 

[AA4]

May I understand it this way? In the 64-pin package of the STM32F412RGT6 chip, there is indeed an FSMC (Flexible Serial Memory Controller), and this function has not been disabled. However, due to the limitations of the package, the complete set of FSMC pins have not been exposed, only an address pin has been driven. Since this is sufficient to control the display, it is referred to as an LCD interface.

[mƎALLEm]

Indeed and with LQFP64 only 8-bit (or less) LCD can be driven and indeed that figure is the correct way to connect the LCD to FSMC.

PS:

 there is indeed an FSMC (Flexible Serial Memory Controller),

FSMC: Flexible Static Memory Controller