SH7243 datasheet(266/1726 Pages) RENESAS

266 / 1726 page

Section 8 Data Transfer Controller (DTC)

Rev. 1.00 Jun. 26, 2008 Page 236 of 1692

REJ09B0393-0100

8.5.10

DTC Activation Priority Order

If multiple DTC activation requests are generated while the DTC is inactive, whether to start the

DTC transfer from the first activation request or according to the DTC activation priority can be

selected through the DTPR bit setting in the bus function extending register (BSCEHR). If

multiple activation requests are generated while the DTC is active, transfer is performed according

to the DTC activation priority. Figure 8.17 shows an example of DTC activation according to the

priority.

Transfer is started for the first activation request

Transfer is performed according to the priority

Other than DTC

DTC

(request 3)

DTC

(request 1)

DTC

(request 2)

Internal bus

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)

Priority

determination

Transfer is started according to the priority

Other than DTC

DTC

(request 1)

DTC

(request 2)

DTC

(request 3)

Internal bus

Priority

determination

Priority

determination

(1) DTPR = 0

(2) DTPR = 1

DTC is inactive

DTC is active

Figure 8.17 Example of DTC Activation According to Priority

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