AN3324 datasheet(29/37 Pages) STMICROELECTRONICS

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AN3324

CPU core initialization

Doc ID 18311 Rev 2

29/37

A.2

Example of SPC56EL60 boot file for Flash

In boot file user has to provide a reset vector in order to run the application from Flash

memory. The standard startup process of SPC56ELX processor consists in execution of the

special boot code which reads specific addresses in a Flash memory where reset

configuration half word is stored together with boot reset vector pointing to first valid

instruction of the code. Refer to “Boot Assist Module (BAM)” section in RM0032 (see B.1:

Reference documents in Appendix B).

In this boot sequence user must initialize SRAM and copy data section from Flash to SRAM

(this operation is made only when user runs code from Flash). As it may see in scratch code

below stated, this copy is split into two steps and between them it is inserted software

watchdog refresh to avoid device reset.

Table 3.

SPC56EL60 registers to initialize

r0 - r31

spr1

spr8-spr9

spr22

spr26 - spr27

spr54

spr58 - spr59

spr61-spr63

spr256

spr272 - spr279

spr284 - spr285

spr318 - spr319

spr340

spr400-spr415

spr512

spr528-spr530

spr562

spr570 - spr571

spr573 - spr575

spr604 - spr605

spr628

spr630

ACC

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