Rev. 1.0, 09/02, page 115 of 568
Table 8.5
DTC Execution Status
Mode
Vector Read
I
Register Information
Read/Write
J
Data Read
K
Data Write
L
Internal
Operations
M
Normal
1
6
1 1 3
Repeat
1
6
1 1 3
Block
transfer
1
6
N N 3
Legend
N: Block size (initial setting of CRAH and CRAL)
Table 8.6
Number of States Required for Each Execution Status
Object to be Accessed
On-
Chip
RAM
On-
Chip
ROM
On-Chip 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
status
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
Note:
*
Not available in this LSI.
The number of execution states is calculated from using the formula below. Note that
Σ
is the sum
of all transfers activated by one activation source (the number in which the CHNE bit is set to 1,
plus 1).
Number of execution states = I · (1
+
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 the on-chip ROM, normal mode is
set, and data is transferred from on-chip ROM to an internal I/O register, then the time required for
the DTC operation is 13 states. The time from activation to the end of the data write is 10 states.
Содержание H8S/2627
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