m30262f8gp Renesas Electronics Corporation., m30262f8gp Datasheet - Page 81

• Manufacturer Part Number: m30262f8gp
• Description: Renesas 16-bit Cmos Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

DMAC
Figure 1.11.6. An example of DMA transfer effected by external factors
(3) The priorities of channels and DMA transfer timing
If a DMA transfer request signal falls on a single sampling cycle (a sampling cycle means one period from
the leading edge to the trailing edge of BCLK), the DMA request bits of applicable channels concurrently
turn to “1”. If the channels are active at that moment, DMA0 is given a high priority to start data transfer.
When DMA0 finishes data transfer, it gives the bus right to the CPU. When the CPU finishes single bus
access, then DMA1 starts data transfer and gives the bus right to the CPU.
An example in which DMA transfer is carried out in minimum cycles at the time when DMA transfer
request signals due to external factors concurrently occur.
Figure 1.11.6 shows the DMA transfer effected by external factors.
INT0
DMA0
request bit
INT1
BCLK
DMA0
DMA1
CPU
DMA1
request bit
Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative and subject to change.
An example in which DMA transmission is carried out in minimum
cycles at the time when DMA transmission request signals due to
external factors concurrently occur.
Renesas Technology Corp.
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M16C/26 Group
Obtainment
of the bus
right
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