HD64F2149YV datasheet(873/1075 Pages) RENESAS

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Appendix A Instruction Set

Rev. 3.00 Jan 18, 2006 page 845 of 1044

REJ09B0280-0300

A.4

Number of States Required for Execution

The tables in this section can be used to calculate the number of states required for instruction

execution by the H8S/2000 CPU. Table A.5 shows the number of instruction fetch, data

read/write, and other cycles occurring in each instruction, and table A.4 shows the number of

states required per cycle according to the bus size. The number of states required for execution of

an instruction can be calculated from these two tables as follows:

Number of states = I

× S

I + J × SJ + K × SK + L × SL + M × SM + N × SN

Examples of Calculation of Number of States Required for Execution

Examples: Advanced mode, stack located in external address space, on-chip supporting modules

accessed in two states with 8-bit bus width, external devices accessed in three states with one wait

state and 16-bit bus width.

1. BSET #0,@FFFFC7:8

From table A.5, I = L = 2 and J = K = M = N = 0

From table A.4, S

I = 4 and SL = 2

Number of states = 2

× 4 + 2 × 2 = 12

2. JSR @@30

From table A.5, I = J = K = 2 and L = M = N = 0

From table A.4, S

I = SJ= SK = 4

Number of states = 2

× 4 + 2 × 4 + 2 × 4 = 24

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