SH7021 datasheet(204/509 Pages) RENESAS

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ch0

> ch3 > ch2 > ch1

ch3

> ch2 > ch1 > ch0

ch0

> ch3 > ch2 > ch1

ch2

> ch1 > ch0 > ch3

ch0

> ch3 > ch2 > ch1

ch1

> ch0 > ch3 > ch2

ch2

> ch1 > ch0 > ch3

ch0

> ch3 > ch2 > ch1

ch0

> ch3 > ch2 > ch1

(1) When channel 0 transfers

Initial priority order

Priority order

after transfer

(2) When channel 3 transfers

Initial priority order

Priority order

after transfer

(3) When channel 2 transfers

Initial priority order

Priority order

after transfer

Post-transfer priority order when

there is an immediate transfer

request to channel 3 only

(4) When channel 1 transfers

Initial priority order

Priority order

after transfer

Channel 3 becomes bottom

priority. The priority of channel

0, which was higher than

channel 3, is also shifted.

Channel 0 becomes

bottom priority

Channel 2 becomes bottom

priority. The priority of channels

0and 3, which were higher than

channel 2, are also shifted.

If immediately thereafter there

is a request to transfer channel

3 only, channel 3 becomes

bottom priority and the priority

of channels 0 and 1, which

were higher than channel 3,

are also shifted.

Priority order does not change

Figure 9.3 Round-Robin Mode

Figure 9.4 shows how the priority order changes when channel 0 and channel 1 transfers are

requested simultaneously and a channel 3 transfer is requested during the channel 0 transfer. The

DMAC operates as follows:

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