HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 347
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HD6417660
Manufacturer Part Number
HD6417660
Description
Renesas 32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417660.pdf
(846 pages)
- Current page: 347 of 846
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Bit
25
24
23 to 19
18
17
Bit Name
PR1
PR0
AE
NMIF
Initial
Value R/W
0
0
All 0
0
0
R/W
R/W
R
R/(W)* Address Error Flag
R/(W)* NMI Flag
Description
Priority Mode
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
Reserved
These bits are always read as 0. The write value should
always be 0. If 1 is written to these bits, correct operation
cannot be guaranteed.
AE indicates that an address error occurred during DMA
transfer. When the AE bit is set, the DMA transfer is not
enabled even if the DE bit of CHCR and the DME bit of
DMAOR are set to 1. This bit can only be cleared by writing 0
after reading 1.
0: No DMAC address error
1: DMAC address error
NMIF indicates that an NMI interrupt occurred. When the
NMIF bit is set, the DMA transfer is not enabled even if the
DE bit of CHCR and the DME bit of DMAOR are set to 1.
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
Clearing conditions: Writing NMIF = 0 after NMIF = 1 read
1: NMI interrupt occurs
Clear conditions: Writing AE = 0 after AE = 1 read
Rev. 1.00, 02/04, page 309 of 804
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