H838532H datasheet(463/508 Pages) RENESAS

No. de pieza	H838532H

Descripción Electrónicos	16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series

PDF	508 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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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:

I = 2,

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:

I = SJ = SK = 2

Number of states required for execution = 2

× 2 + 1 × 2+ 1 × 2 = 8

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