HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 485

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

470
Notes: 1. In auto-request mode, the transfer will start when the NMIF, AE, and TE bits are all 0
2. Cycle-steal mode.
3. In burst mode, DREQ = edge detection (external request), or auto-request mode in
4. 16-byte transfer cycle in progress.
5. End of a 16-byte transfer cycle.
and the DE and DME bits are then set to 1.
burst mode.
VCRDMA, DRCR, DMAOR)
(SAR, DAR, TCR, CHCR,
SAR, and DAR updated
AE = 1, or DE = 0, or
transfer request been
DEI interrupt request
DME = 1 and NMIF,
TCR-1
Initial settings
(when IE = 1)
End transfer
AE, TE = 0?
NMIF = 1, or
generated?*
TCR = 0?
Yes
DME = 0?
Yes
Yes
Yes
Transfer
TE = 1
Has a
Start
DE,
TCR,
1
Figure 11.2 DMA Transfer Flow
No
No
No
No
16-byte transfer
in progress?
End normally
TE = 1
*
4
or AE = 1, or DE = 0,
*
Transfer aborted
3
request mode, DREQ detec-
NMIF = 1,
Yes
or DME
*
5
= 0?
mode, transfer
tion method?
Bus
*
2
No