M30621ECGP MITSUBISHI [Mitsubishi Electric Semiconductor], M30621ECGP Datasheet - Page 67

• Manufacturer Part Number: M30621ECGP
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

DMAC
Figure 1.12.6. 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 1.12.6 An example of DMA transfer effected by external factors.
BCLK
DMA0
DMA1
CPU
INT0
INT1
DMA1
request bit
DMA0
request bit
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.
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
M16C / 62 Group (80-pin)
Mitsubishi microcomputers
Obtainm
ent of the
bus right
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