LPC1833FET256 POR/FW initial time check

[tony567]

Hi, NXP team,

could you please advise where I can find the LPC1833FET256 POR timing and FW initial timing related parameters? Thanks.

[xiangjun_rong]

Hi,

Pls refer to section 4.3.7 Boot process timing in UM10430.pdf, I copy it here.

It talks about the POR timing.

Hope it can help you
BR

XiangJun Rong

[tony567]

Hi, XiangJun Rong,

   thanks a lot, I did not read the whole book...sorry, so are there any signals can be measured to indicate this timing? we want to compare the timing with system level...thanks.

[xiangjun_rong]

Hi,

If you want to test the delay between the power supply rising edge or Reset pin rising edge and the LPC18xx application code, in you application code, you can toggle a GPIO, you can test the delay.

For example

initGPIOPin();

for(;;)

{

ToggleGPIO();
}

Hope it can help you

BR

XiangJun Rong

[tony567]

hI, XiangJun Rong

   how about EMC_CS0(P1_5) signal, from EMC_CS0 beginning to active, could I say the code is going to run? thanks.

[xiangjun_rong]

Hi,

I do not know if you configure the P1_5 pin as GPIO and toggle it to test the time of starting-up or configure the pin as EMC_CS0 to access external memory and test the time of starting-up, I think either of them is okay.

If you use the pin as EMC_CS0, this is the code:

...

init_EMC();

for(;;)

{

*(BYTE *)EMC_SRAM_ADDRESS=0x012;

}

Pls have a try.

BR

XiangJun Rong

[tony567]

Hi, XiangJun Rong,

   thanks a lot, but unfortunately, I am a pure HW engineer, the coding is owned by customer and third party company, ...so do you have an email address, could I have the hornor to send you an email to discuss the related issue.

[xiangjun_rong]

Hi, Tony,

I am sorry for the delay.

I suppose that you can download LPCOpen package, there are a lot of examples. You can download the software package from the link:

https://www.nxp.com/design/microcontrollers-developer-resources/lpcopen-libraries-and-examples/lpcop...

You can download the code and have a try.

If you want to measure the start-up time, you can try the led toggling example and put the toggling code at the first position in the project but after the GPIO pin initialization.

Hope it can help you

BR

XiangJun Rong