CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
User’s Manual U12688EJ4V0UM00
195
(2) Condition
2
Condition
Word data access with external memory at the 8-bit data bus width
Response time
Tdata
×
4 + Tref
DMARQn (input)
DMAAKn (output)
D0 to D15 (input/output)
Data (1/4)
Data (2/4)
Data (3/4)
Data (4/4)
Refresh
DMA cycle
(3) Condition 3
Condition
Instruction fetch from external memory at the 8-bit data bus width.
Execution of the bit manipulation instruction (SET1, CLR1, NOT1).
Response time
Tinst
×
4 + Tdata
×
2 + Tref
DMARQn (input)
DMAAKn (output)
D0 to D15 (input/output)
Fetch (1/4)
Data read
Fetch (2/4) Fetch (3/4)
Fetch (4/4)
Data write
Refresh
DMA cycle
Remarks 1. Tinst: The number of clocks per bus cycle during instruction fetch.
Tdata: The number of clocks per bus cycle during data access.
Tref:
The number of clocks per refresh cycle.
2. n = 0 to 3
Содержание V850E/MS1 UPD703100
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