HD6432646 Hitachi, HD6432646 Datasheet - Page 226

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

8.3
8.3.1
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 8-2 shows a flowchart of DTC operation.
192
Operation
Overview
Read register information
Write register information
Clear an activation flag
Transfer Counter= 0
Read DTC vector
Data transfer
or DISEL= 1
No
No
CHNE=1
Figure 8-2 Flowchart of DTC Operation
Start
End
Yes
Yes
Next transfer
Interrupt exception
Clear DTCER
handling