Rev. 5.00, 12/03, page 208 of 1088
Table 7-10 Number of States Required for Each Execution Phase
Access To:
On-
Chip
RAM
On-
Chip
ROM
Internal I/O
Registers
External Devices
Bus width
32
16
8
16
8
16
Access states
1
1
2
2
2
3
2
3
Execution
Vector read
S
I
—
1
—
—
4
6+2m 2
3+m
phase
Register
information
read/write
S
J
1
—
—
—
—
—
—
—
Byte data read
S
K
1
1
2
2
2
3+m
2
3+m
Word data read
S
K
1
1
4
2
4
6+2m 2
3+m
Byte data write
S
L
1
1
2
2
2
3+m
2
3+m
Word data write
S
L
1
1
4
2
4
6+2m 2
3+m
Internal operation S
M
1
The number of execution states is calculated from the formula below. Note that
Σ
means the sum
of all transfers activated by one activation event (the number in which the CHNE bit is set to 1,
plus 1).
Number of execution states = I · S
I
+
Σ
(J · S
J
+ K · S
K
+ L · S
L
) + M · S
M
For example, when the DTC vector address table is located in on-chip ROM, normal mode is set,
and data is transferred from the on-chip ROM to an internal I/O register, the time required for the
DTC operation is 13 states. The time from activation to the end of the data write is 10 states.
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