AN3307

Class B solution structure

Doc ID 18186 Rev 4

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5.2.1

CPU startup self-test

The CPU startup self-test tests the core flags, registers and stack pointers for correct

functionality. If any error is found, it jumps directly to the Fail Safe routine. The source files

are written in assembly , and there are two different files for the IAR and KEIL development

environments. The structure is given in Figure 7.

Figure 7.

CPU startup self-test structure

MS18594V1

Test Flags

Test R0

Test link register R14

Test R1to R12

Test OK

Fail Safe routine

Fail

Fail

Fail

Fail

Verify ramp pattern R 0 to R 12

Test Process Stack Pointer

Test Stack Pointer R13

Fail

Fail

Fail