r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 221

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

8.5.10
In the case where multiple DTC activation requests are generated while the DTC is inactive, it is
selectable whether the DTC starts transfer in the order of activation request generation or in the
order of priority for DTC activation. This selection is made by the setting of the DTPR bit in the
bus function extending register (BSCEHR). On the other hand, if multiple activation requests are
generated while the DTC is active, transfer is performed according to the priority order for DTC
activation. Figure 8.17 shows an example of DTC activation according to the priority.
(1) DTPR = 0
(2) DTPR =1
DTC activation request 1
(High priority)
DTC activation request 2
(Medium priority)
DTC activation request 3
(Low priority)
DTC activation request 1
(High priority)
DTC activation request 2
(Medium priority)
DTC activation request 3
(Low priority)
DTC Activation Priority Order
Internal bus
Internal bus
Figure 8.17 Example of DTC Activation in Accordance with Priority
Transfer is performed according to the priority
Transfer is started for the request
that is generated first
DTC is inactive
DTC is inactive
Other than DTC
Other than DTC
DTC (request 3)
DTC (request 1)
Priority
determination
Rev. 1.00 Sep. 21, 2007 Page 195 of 1124
Transfer is performed according to the priority
Transfer is performed according to the priority
Section 8 Data Transfer Controller (DTC)
DTC (request 1)
Priority
determination
DTC (request 2)
DTC is active
DTC is active
Priority
determination
DTC (request 2)
DTC (request 3)
REJ09B0402-0100