FUJITSU MB91F109 FR30 - Manual (Page 406)

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APPENDIX B Interrupt Vectors
Reference:
The area 1 kilobyte after the address indicated by the TBR is a vector address for EIT.
Each vector is 4 bytes in size. The relationship between the vector number and vector
address is as follows:
vctadr = TBR + vctofs
= TBR + (3FC
H
- 4 × vct)
vctadr: Vector address
vctofs: Vector offset
vct: Vector number