Support external crystal for RA6M5

Hello,

Which was the hardware modification ?

This is a sub-clock oscillator, not main clock oscillator (XTAL): 

Is there a main clock oscillator connected to the device ?

Make sure the oscillator pins are enabled on the pin configurations:

Hi AZ,

Thanks for the information.

Here's the old design:

There is nothing connected to XTAL:

So there is no main clock oscillator connected. Then this option should be set as 'Not Populated' because there is no main clock oscillator.

Note. I would also recommend to update the FSP version.

Thanks AZ. 

I tried the solution. It doesn't work. The internal clock was used in our project. For this new added crystal, how should I use it? From the clock configuration, I only see the HOCO and XTAL options from "PLL Src:". Here is the existing clock configuration:

Is there a main clock oscillator connected on your current design ?

The reason we added the external 32768Hz crystal is to improve the RTC accuracy. 

We'll change the RTC source to use RTC_CLOCK_SOURCE_SUBCLK. Other than that, should we also change the Clock confiugration in the Smart Configurator?

Thanks.

Ok, but I am asking about the existence of main clock oscillator - not sub-clock oscillator.

If there is not a main clock oscillator connected to P212, P213 pins then this should be set to 'Not Populated':

Yes, I set the "Main Oscillator Populated" as "Not Populated". It didn't work. The firmware was stuck at "FSP_HARDWARE_REGISTER_WAIT(R_SYSTEM->OSCSF_b.MOSCSF, 1U);".

How have you configured the CGC pins ?

Make sure you Generate Project Content, build and then debug after every change on FSP Configurator.

Hi AZ,

Thanks for the info!

I had the the CGC configuration as follow:

However, after the project content was generated, I don't see the P212 and P213 in the pin cfg data:

const ioport_pin_cfg_t g_bsp_pin_cfg_data[] = {
 {
 .pin = BSP_IO_PORT_00_PIN_00,
 .pin_cfg = ((uint32_t) IOPORT_CFG_ANALOG_ENABLE)
 },
 {
 .pin = BSP_IO_PORT_00_PIN_01,
 .pin_cfg = ((uint32_t) IOPORT_CFG_ANALOG_ENABLE)
 },
 {
 .pin = BSP_IO_PORT_00_PIN_02...

As there is no XTAL/EXTAL in our design, I thought maybe I should choose "Sub Osc"

After the project content is generated, there is no any PIN for XCIN or XCOUT.

I suppose the "Clock Source" for the RTC should be "Sub-Clock"

Other than that, is there anything else I should configure?

Basically, my question is, there is a new hardware change. That is, an external 32768Hz crystal is connected to XCIN/XCOUT. What are the necessary steps to take in order to utilize this crystal for RTC?

Thanks!