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Rev. 5.00, 09/03, page 346 of 760
Normal end
AE = 1 or
NMIF = 1 or
DE = 0 or
DME = 0?
Bus mode,
transfer request mode,
DREQ detection selection
system
Initial settings
(SAR, DAR, DMATCR, CHCR, DMAOR)
Transfer (1 transfer unit);
DMATCR
−
1 → DMATCR,
SAR and DAR updated
DEI interrupt request (when IE = 1)
No
Yes
No
Yes
No
Yes
Yes
No
Yes
No
*
3
*
2
Start
Transfer aborted
DMATCR = 0?
Transfer request?*
1
DE, DME = 1 and
AE, NMIF, TE = 0?
Does
AE = 1 or
NMIF = 1 or
DE = 0 or DME
= 0?
Transfer end
Notes: 1.
In auto-request mode, transfer begins when AE, NMIF, and TE are both 0 and the DE and
DME bits are set to 1.
2.
DREQ = level detection in burst mode (external request) or cycle-steal mode.
3. DREQ = edge detection in burst mode (external request), or auto-request mode in burst mode.
Figure 11.2 DMAC Transfer Flowchart