CHAPTER 4 BUS CONTROL FUNCTION
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User’s Manual U15195EJ5V0UD
4.5 Bus
Access
4.5.1 Number
of access clocks
The number of basic clocks required to access each resource is shown below.
Bus Cycle Status
Resource (Bus Width)
Instruction Fetch
Operand Data Access
Internal ROM (32 bits)
1
Note 1
5
Internal RAM (32 bits)
1
Note 2
1
On-chip peripheral I/O (16 bits)
−
5
Note 3
External memory (16 bits)
3
Note 3
3
Note 3
Notes 1.
This value is 2 in the case of instruction branch.
2.
This value is 2 if there is conflict with data access.
3.
MIN. value
Remark
Unit: Clock/access
Содержание PD703114
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