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R01UH0336EJ0102 Rev.1.02
Page 232 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 5 DMA Module
Figure 5-7
Example of Single-Step Transfer (128 Bits, DMA Channel Priority: CH0
(High) > CH1 (Low))
CPU
CPU
CPU
CPU
CPU
CPU
CPU
CPU
CH0
CH1
DMA1
Read
DMA1
Read
DMA1
Read
DMA1
Read
DMA0
Read
DMA1
Write
DMA1
Write
DMA1
Write
DMA1
Write
DMA1
Write
· Software DMA transfer request (CH1)
· DMA transfer count setting: 1 time
Hardware DMA
transfer request 0
(input)
Acknowledge 0
(output)
*
*
*
*
*
*
*
*
Transfer
completed
Note:
*
The bus is always released. When the CPU requests the bus mastership, the CPU acquires the bus mastership.