HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 417
HD6433640
Manufacturer Part Number
HD6433640
Description
H8/3644 Series Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6433640.pdf
(508 pages)
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A.3
The tables here can be used to calculate the number of states required for instruction execution.
Table A.3 indicates the number of states required for each cycle (instruction fetch, branch address
read, stack operation, byte data access, word data access, internal operation).
Table A.4 indicates the number of cycles of each type occurring in each instruction. The total
number of states required for execution of an instruction can be calculated from these two tables as
follows:
Examples: When instruction is fetched from on-chip ROM, and an on-chip RAM is accessed.
From table A.4:
From table A.3:
Number of states required for execution = 2
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.
From table A.4:
From table A.3:
Number of states required for execution = 2
BSET #0, @FF00
I = L = 2,
S
JSR @@ 30
I = 2,
S
I
I
= 2,
= S
Execution states = I
Number of Execution States
J
= S
J = K = 1,
S
K
L
= 2
J = K = M = N= 0
= 2
L = M = N = 0
S
I
+ J S
J
+ K
2 + 2 2 = 8
2 + 1 2+ 1 2 = 8
S
K
+ L
S
L
+ M
S
M
+ N
S
N
413
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