How to configure the high state tick period of 0 with sent module on MPC5746R

[fanshichencao]

Hello，

          As shown in the figure below.According to the sent protocol,It is configurable that the value 0 contains high pluse tick period(The standard value is 7) and low pluse tick period(The standard value is 7).but it can be configured for other values.

            The MCU I used is MPC5746R，I'm debugging its sent module.Now I need to implement a requirement.What I need to implement is that the above parameters(high pluse tick period and low pluse tick period) are configurable.I think there should be relevant registers that can configure the above parameters.Which registers of send module should I operate to make the above parameters programmable and configurable?

[PetrS]

Hi,

this is not configurable in the MPC5746R SENT receiver module.

You just have to program channel's prescaler value (for Receiver Clock) to match the Sensor Tx Clock
period within channel Clock Control register (SRX_CHn_CLK_CTRL). You can refer to chapter 53.5.1 Initialization sequence of the RM.

BR, Petr

[fanshichencao]

Hello Petr，

         Thank you very much for your reply, which is very helpful to me.I have another question，Does the MPC5746R SENT receiver module support sent's standard SAE J2716-2016?

[zhangguowang]

hello, I want to use SENT in MPC5744P, the reference manual has the following description 

However, I think time below 3us can be obtained by set the SRX_CHn_CLK_CTRL register.

For example,  the High Frequency Receiver clock is 100MHz(0.01us), and the SRX_CHn_CLK_CTRL register is set as 1.5/0.01=150

So what will happen in this case?

The unit tick time of my signal source is 1.5us.

[PetrS · Accepted solution]

Hi,

as per the RM the module is based on the SAE J2716-2010.

BR, Petr