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User’s Manual U11969EJ3V0UM00
83
CHAPTER 4 BUS CONTROL FUNCTION
4.3 Bus Access
4.3.1 Number of access clocks
The number of basic clocks necessary for accessing each resource is as follows:
Resource (bus width)
Bus Cycle Type
Internal ROM
Internal RAM
Internal Peripheral
External Memory
(32 bits)
(32 bits)
I/O (16 bits)
(16 bits)
Instruction fetch
1
3
Disabled
3 + n
Operand data access
3
1
3 + n
3 + n
Remarks 1. Unit : clock/access
2. n
: number of wait insertions
Содержание V854 UPD703006
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