Rev.6.00 Oct.28.2004 page 233
of 1016
REJ09B0138-0600H
7.5.15
NMI Interrupts and DMAC
When an NMI interrupt is requested, burst mode transfer in full address mode is interrupted. An NMI interrupt does not
affect the operation of the DMAC in other modes.
In full address mode, transfer is enabled for a channel when both the DTE bit and the DTME bit are set to 1. With burst
mode setting, the DTME bit is cleared when an NMI interrupt is requested.
If the DTME bit is cleared during burst mode transfer, the DMAC discontinues transfer on completion of the 1-byte or 1-
word transfer in progress, then releases the bus, which passes to the CPU.
The channel on which transfer was interrupted can be restarted by setting the DTME bit to 1 again. Figure 7-36 shows the
procedure for continuing transfer when it has been interrupted by an NMI interrupt on a channel designated for burst mode
transfer.
Resumption of
transfer on interrupted
channel
Set DTME bit to 1
Transfer continues
[1]
[2]
DTE = 1
DTME = 0
Transfer ends
No
Yes
[1]
[2]
Check that DTE = 1 and
DTME = 0 in DMABCRL
Write 1 to the DTME bit.
Figure 7-36 Example of Procedure for Continuing Transfer on Channel Interrupted by NMI Interrupt
Содержание ZTAT H8S/2357F
Страница 4: ......
Страница 28: ...Rev 6 00 Oct 28 2004 page xxiv of xxiv REJ09B0138 0600H...
Страница 82: ...Rev 6 00 Oct 28 2004 page 54 of 1016 REJ09B0138 0600H...
Страница 108: ...Rev 6 00 Oct 28 2004 page 80 of 1016 REJ09B0138 0600H...
Страница 364: ...Rev 6 00 Oct 28 2004 page 336 of 1016 REJ09B0138 0600H...
Страница 438: ...Rev 6 00 Oct 28 2004 page 410 of 1016 REJ09B0138 0600H...
Страница 566: ...Rev 6 00 Oct 28 2004 page 538 of 1016 REJ09B0138 0600H...
Страница 588: ...Rev 6 00 Oct 28 2004 page 560 of 1016 REJ09B0138 0600H...
Страница 688: ...Rev 6 00 Oct 28 2004 page 660 of 1016 REJ09B0138 0600H...
Страница 694: ...Rev 6 00 Oct 28 2004 page 666 of 1016 REJ09B0138 0600H...
Страница 708: ...Rev 6 00 Oct 28 2004 page 680 of 1016 REJ09B0138 0600H...
Страница 1044: ...Rev 6 00 Oct 28 2004 page 1016 of 1016 REJ09B0138 0600H...
Страница 1047: ...H8S 2357 Group H8S 2357F ZTATTM H8S 2398F ZTATTM Hardware Manual 2 6 2 Ote machi Chiyoda ku Tokyo 100 0004 Japan...