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H838532H Datasheet(PDF) 463 Page - Renesas Technology Corp |
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H838532H Datasheet(HTML) 463 Page - Renesas Technology Corp |
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463 / 508 page ![]() Appendix Rev. 1.00 May 30, 2008 Page 443 of 484 REJ09B0436-0100 A.3 Number of Execution States The status of execution for each instruction of the H8/300H CPU and the method of calculating the number of states required for instruction execution are shown below. Table A.4 shows the number of cycles of each type occurring in each instruction, such as instruction fetch and data read/write. Table A.3 shows the number of states required for each cycle. The total number of states required for execution of an instruction can be calculated by the following expression: Execution states = I × S I + J × SJ + K × SK + L × SL + M × SM + N × SN Examples: When instruction is fetched from on-chip ROM, and an on-chip RAM is accessed. BSET #0, @FF00 From table A.4: I = L = 2, J = K = M = N= 0 From table A.3: S I = 2, S L = 2 Number of states required for execution = 2 × 2 + 2 × 2 = 8 When instruction is fetched from on-chip ROM, branch address is read from on-chip ROM, and on-chip RAM is used for stack area. JSR @@ 30 From table A.4: I = 2, J = K = 1, L = M = N = 0 From table A.3: S I = SJ = SK = 2 Number of states required for execution = 2 × 2 + 1 × 2+ 1 × 2 = 8 |
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