CHAPTER 4 BUS CONTROL FUNCTION
116
User’s Manual U14492EJ3V0UD
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
Programmable peripheral I/O
−
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 contention with data access.
3.
MIN.
value
Remark
Unit: Clock/access
Содержание V850E/IA1 mPD703116
Страница 2: ...2 User s Manual U14492EJ3V0UD MEMO...