startup sequence in detail of kinetis microcontrollers

josephxavier — Fri, 26 Feb 2016 06:25:23 GMT

can anyone share me a link to study the startup sequence in detail of kinetis microcontroller. I need to prepare a presentation on it.

Re: startup sequence in detail of kinetis microcontrollers

kerryzhou — Fri, 26 Feb 2016 07:45:49 GMT

Hi josephxavier,

About the startup sequence, if you find a kinetis sample code, it doesn't difficult to understand.

1. POR and the chip is reset

2. enter in the Reset_Handler, which you can find it from the .s file.

take KL25 KSDK1.3.0 sample code as an example.

Reset_Handler

CPSID I ; Mask interrupts

LDR R0, =SystemInit

BLX R0

LDR R0, =init_data_bss

BLX R0

CPSIE I ; Unmask interrupts

LDR R0, =__iar_program_start

BX R0

PUBWEAK NMI_Handler

SECTION .text:CODE:REORDER:NOROOT(1)

3. enter the SystemInit function.

this function will have the disable watchdog code and the clock setup code, for details, please refer to the sample code.

4. enter init_data_bss function

this function is make necessary initializations for the RAM

5. enter main function, which you can find it from __iar_program_start

Besids, in the K series and KL series quick reference, there still have some startup routines description, you can refer to it.

chapter 1.1.4.2 Startup routines

Wish it helps you!

If you still have question, please contact with me!

Have a great day,

Jingjing

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