HD6433935 Hitachi, HD6433935 Datasheet - Page 429
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HD6433935
Manufacturer Part Number
HD6433935
Description
8-Bit MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6433935.pdf
(521 pages)
- Current page: 429 of 521
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A.3
The tables here can be used to calculate the number of states required for instruction execution.
Table A-4 indicates the number of states required for each cycle (instruction fetch, read/write,
etc.), and table A-3 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:
Execution states = I
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,
From table A-3:
S
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.
JSR @@ 30
From table A-4:
I = 2,
From table A-3:
S
Number of states required for execution = 2
Table A-3
Execution Status
(instruction cycle)
Instruction fetch
Branch address read
Stack operation
Byte data access
Word data access
Internal operation
Note:
I
I
= 2,
= S
J
= S
*
J = K = 1,
S
Number of Execution States
K
L
Depends on which on-chip module is accessed. See 2.9.1, Notes on Data Access for
details.
= 2
J = K = M = N= 0
= 2
Number of Cycles in Each Instruction
L = M = N = 0
S
I
+ J S
S
S
S
S
S
S
I
J
K
L
M
N
J
+ K S
Access Location
On-Chip Memory
2
1
K
+ L S
2 + 2 2 = 8
2 + 1 2+ 1 2 = 8
L
+ M S
M
+ N S
On-Chip Peripheral Module
—
2 or 3*
—
1
N
417
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