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Section 13 Direct Memory Access Controller (DMAC)
Rev. 4.00 Sep. 14, 2005 Page 417 of 982
REJ09B0023-0400
Bit Bit
Name
Initial
Value R/W Description
25
24
PR1
PR0
0
0
R/W
R/W
Priority Mode 1, 0
PR1 and PR0 select the priority level between
channels when there are transfer requests for multiple
channels simultaneously.
00: Fixed mode 1: CH0 > CH1 > CH2 > CH3
01: Fixed mode 2: CH0 > CH2 > CH3 > CH1
10: The status of the channel select round-robin mode:
RCn bit is reflected to the priority.
11: All channel round-robin mode
23 to 19
All
0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
18 AE
0 R/(W)
*
Address
Error
Flag
AE indicates that an address error occurred during
DMA transfer. If this bit is set during data transfer,
transfers on all channels are suspended. The CPU
cannot write 1 to this bit. This bit can only be cleared
by writing 0 after reading 1.
0: No DMAC address error
1: DMAC address error
[Clear condition]
Writing AE = 0 after AE = 1 read
17 NMIF 0 R/(W)
*
NMI
Flag
NMIF indicates that a NMI interrupt occurred. This bit
is set regardless of whether DMAC is in operating or
halt state. The CPU cannot write 1 to this bit. Only 0
can be written to clear this bit after 1 is read.
When the NMI is input, the DMA transfer in progress
can be done in one transfer unit. When the DMAC is
not in operational, the NMIF bit is set to 1 even if the
NMI interrupt was input.
0: No NMI input
1: NMI interrupt occurs
[Clearing condition]
Writing NMIF = 0 after NMIF = 1 read
Содержание HD6417641
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Страница 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Страница 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
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Страница 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Страница 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Страница 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Страница 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Страница 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Страница 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Страница 500: ...Section 13 Direct Memory Access Controller DMAC Rev 4 00 Sep 14 2005 Page 450 of 982 REJ09B0023 0400...
Страница 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Страница 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Страница 734: ...Section 18 Multi Function Timer Pulse Unit MTU Rev 4 00 Sep 14 2005 Page 684 of 982 REJ09B0023 0400...
Страница 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Страница 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Страница 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Страница 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Страница 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Страница 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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Страница 1036: ...SH7641 Hardware Manual...