MPC5634M SCI not working during serial boot

[MichaelSun]

Hi Support team,

I want to use the serial boot function to download code into SRAM. 

I set "BootCFG " to 1 , set "EVTO" to 0 and connect SCA_A_TX to UART_RX , SCA_A_RX to UART_TX. If i understand correctly, when the host send the password,the device should transmits back the same data i sent.

But when i send the password, i didn't get any reply form the device. I only can receive  the following shape from the SCA_A_TX.

[lukaszadrapa · Accepted solution]

Hi @MichaelSun 

if you pulled the EVTO down, it select baud rate detection. Do you follow the procedure?

After sending the zero byte, you should add some small delay to allow the reconfiguration and then you can send the password. Notice that is is important to wait for each echo character. Once echo character is received, you can send next character. 

Regards,

Lukas

[MichaelSun]

Thanks for your help. The problem is solved. You can close the ticket.

[MichaelSun]

Ok, I misunderstand the description. I want to use fixed baud rate mode , so now i pulled the EVTO up. 

The crystal is 8Mhz. So the fixed baud rate should be 9600.

But I still cannot get any response after i send the password. Is there anything else i missed?