LPC11E6x Boot Behavior PIO0_3

[mikenn]

Hello,

LPC11E6x enters ISP mode when PIO0_1 is sampled low after reset, assuming no watchdog flag or CRP.  After this determination, is there any dependency on PIO0_3 to decide what happens next, or does it enter UART ISP directly?

The User Manual states there is no USB boot facility on LPC11E6x but there is a flow chart Figure 86 which does not clearly state what happens based on the status of the USB ISP pin PIO0_3.

I need PIO0_3 for something else and cannot guarantee it would always be low on boot.

MikeN

[xiangjun_rong · Accepted solution]

Hi,

As you know that the LPC11E6x does not have USB port, it can not boot application code from USB port. The PIO0_1 pin is the only pin to be sampled during/after Reset to determine if boot mode is entered and boot from uart0 pins or application code is executed from flash.

The PIO0_3 is NOT sampled during/after Reset for LPC11E6x, you can use PIO0_3 pin as general GPIO pin.

Hope it can help you

BR

XiangJun Rong