1. LPC1766FBD100 can update FW via ISP UART baud rate 38400, 57600 and 115200 on prototype board.
2. Change MUC from LPC1766FBD100 to LPC54606J512BD100 (same prototype board)
3. LPC54606J512BD100 can update FW via ISP UART baud rate 38400 only.
Please advise, How to increase baud rate ISP UART for update FW to LPC54606J512BD100?
I try to replicate this on my side using LPCXpresso54608 and Flash Magic but I could successfully use higher baud rate via ISP UART.
Are you resetting the device once you have successfully connected to a certain baud rate? The MCU needs to enter initial state in order to do autobaud rate.
I also try to test with EVAL Board LPC54608 with Flash magic the baud rate can be run 115200.
Now I found the problem come from RS232 driver use part MAX232 (5V). Change to MAX3232 (3.3V to 5V) then can solve this issue.
1.MAX232 can used with LPC1766 (Customer prototype board)
2.MAX232 can used with LPC54608 (NXP EVAL board)
3.MAX232 can't use with LPC54606 (Customer prototype board)
Can you explain MAX232 (5V) why can't use with LPC54606? Please advise.
This seems to be a problem with your MAX232 circuit. Unfortunately, I cannot help with that as I cannot replicate your issue with my board.
Sorry for any inconveniences.