For how much time system bootloader remain in bootloader mode

[vchau.2]

Hi

In my hardware BOOT0 pin high after 12ms(Due to some hardware dependency) of power up, In this scenario MCU isn't going to bootloader mode, So I want to know For How much time mcu remain in bootloader mode at power up.

[KnarfB]

May depend on the chip which you don't specify.

RM0394

Reference manual

STM32L41xxx/42xxx/43xxx/44xxx/45xxx/46xxx

advanced Arm®-based 32-bit MCUs

says:

The values on both BOOT0 (coming from the pin or the option bit) and nBOOT1 bit are latched

on the 4th edge of the internal startup clock source after reset release. It is up to the user to

set nBOOT1 and BOOT0 to select the required boot mode.

hth

KnarfB

[MM..1]

In bootloader when it start leave forever or to next rst or jump command.

If your design delay boot0 you need delay NRST more 🙂