1 Introduction

Test Name: CPU Register Test  

 

Purpose of Test: Detect stuck bits in the CPU registers.  

 

Description: CPU registers are tested for stuck bits and coupling Faults between each of the bits inside the individual registers but not between registers.  

The basic algorithm works as below:  

The test is implemented by successively performing a write, read and check of 0x55 and 0xAA values into the CPU registers. The register is saved into RAM before the test is performed and restored after the test is done.

• Registers must be tested in the following order:

1. WREG

2. WREG_SHAD

3. BSR_SHAD

4. FSR0L_SHAD

5. FSR0H_SHAD

6. FSR1L_SHAD

7. FSR1H_SHAD

8. BSR

9. FSR