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H8/3028F Datasheet(PDF) 267 Page - Renesas Technology Corp

Part # H8/3028F
Description  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  923 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3028F Datasheet(HTML) 267 Page - Renesas Technology Corp

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Rev. 2.00, 09/03, page 237 of 890
7.4.11
NMI Interrupts and DMAC
NMI interrupts do not affect DMAC operations in short address mode.
If an NMI interrupt occurs during a transfer in full address mode, the DMAC suspends operations.
In full address mode, a channel is enabled when its DTE and DTME bits are both set to 1. NMI
input clears the DTME bit to 0. After transferring the current byte or word, the DMAC releases the
bus to the CPU. In normal mode, the suspended transfer resumes when the CPU sets the DTME
bit to 1 again. Check that the DTE bit is set to 1 and the DTME bit is cleared to 0 before setting
the DTME bit to 1.
Figure 7.21 shows the procedure for resuming a DMAC transfer in normal mode on channel 0
after the transfer was halted by NMI input.
Resuming DMAC transfer
in normal mode
DTE = 1
DTME = 0
Set DTME to 1
DMA transfer continues
End
1.
2.
Check that DTE = 1 and DTME = 0.
Read DTCRB while DTME = 0,
then write 1 in the DTME bit.
2
No
Yes
1
Figure 7.21 Procedure for Resuming a DMAC Transfer Halted by NMI (Example)
For information about NMI interrupts in block transfer mode, see section 7.6.6, NMI Interrupts
and Block Transfer Mode.



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