HD6432621 Hitachi, HD6432621 Datasheet - Page 839

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

A.4
The tables in this section can be used to calculate the number of states required for instruction
execution by the CPU. Table A-5 indicates the number of instruction fetch, data read/write, and
other cycles occurring in each instruction. Table A-4 indicates the number of states required for
each cycle. The number of states required for execution of an instruction can be calculated from
these two tables as follows:
Examples: Advanced mode, program code and stack located in external memory, 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
2. JSR @@30
From table A-5:
From table A-4:
Number of states required for execution = 2
From table A-5:
From table A-4:
Number of states required for execution = 2
Execution states = I
I = L = 2, J = K = M = N = 0
S
I = J = K = 2, L = M = N = 0
S
I
I
Number of States Required for Instruction Execution
= 4, S
= S
J
= S
L
K
= 2
= 4
S
I
+ J S
J
+ K S
K
+ L S
4 + 2 2 = 12
4 + 2 4 + 2 4 = 24
L
+ M S
M
+ N S
N
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