HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 352
HD6417660
Manufacturer Part Number
HD6417660
Description
Renesas 32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417660.pdf
(846 pages)
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Figure 10.2 is a flowchart of this procedure.
Rev. 1.00, 02/04, page 314 of 804
Notes: 1 . In auto-request mode, transfer begins when the bits are set as follows:
(SAR, DAR, DMATCR, CHCR, DMAOR, DMARS)
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.
DMATCR – 1 → DMATCR, SAR and DAR
DEI interrupt request (when IE = 1)
When NMIF and AE are cleared to 0, and TE is cleared to 0, and DE and DME are set to 1
or AE = 1 or DE = 0
NMIF, AE, TE = 0?
Transfer (1 transfer unit);
DE, DME = 1 and
Transfer request
Repeat mode?
DMATCR = 0?
or DME = 0?
Yes
Transfer end
Initial settings
Yes
Yes
occurs?*
Yes
NMIF = 1
TE = 1
Start
updated
Figure 10.2 DMA Transfer Flowchart
No
1
Yes
No
No
No
No
Normal end
DMATCR Initialization
IQR → SAR/DAR
*
3
DREQ detection selection
transfer request mode,
or AE = 1 or DE = 0
Bus mode,
Transfer aborted
system
or DME = 0?
NMIF = 1
*
2
Yes
No
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