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9.3
Operation
9.3.1
Overview
When activated, the DTC reads register information that is already stored in memory and transfers
data on the basis of that register information. After the data transfer, it writes updated register
information back to memory. Pre-storage of register information in memory makes it possible to
transfer data over any required number of channels. Setting the CHNE bit to 1 makes it possible to
perform a number of transfers with a single activation.
Figure 9-2 shows a flowchart of DTC operation.
Read register information
Write register information
Clear an activation flag
Start
Read DTC vector
Data transfer
CHNE=1
No
Transfer Counter= 0
or DISEL= 1
No
End
Figure 9-2 Flowchart of DTC Operation
Next transfer
Yes
Yes
Clear DTCER
Interrupt exception
handling
339
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