HD6413003RVF RENESAS [Renesas Technology Corp], HD6413003RVF Datasheet - Page 253
HD6413003RVF
Manufacturer Part Number
HD6413003RVF
Description
microcontroller (MCU)
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413003RVF.pdf
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Table 8-14 Address Ranges Specifiable in MAR and IOAR
MAR
IOAR
MAR bits 23 to 20 are ignored in 1-Mbyte mode.
8.6.8 Bus Cycle when Transfer is Aborted
When a transfer is aborted by clearing the DTE bit or suspended by an NMI that clears the DTME
bit, if this halts a channel for which the DMAC has a transfer request pending internally, a dead
cycle occurs. This dead cycle does not update the halted channel’s address register or counter
value. Figure 8-28 shows an example in which an auto-requested transfer in cycle-steal mode on
channel 0 is aborted by clearing the DTE bit in channel 0.
ø
Address bus
RD
GW, LWR
Figure 8-28 Bus Timing at Abort of DMA Transfer in Cycle-Steal Mode
1-Mbyte Mode
H'00000 to H'FFFFF
(0 to 1048575)
H'FFF00 to H'FFFFF
(1048320 to 1048575)
CPU cycle
T
1
T
2
T
d
T
1
DMAC cycle
T
2
16-Mbyte Mode
H'000000 to H'FFFFFF
(0 to 16777215)
(16776960 to 16777215)
H'FFFF00 to H'FFFFFF
T
1
235
T
2
T
1
CPU cycle
DTE bit is
cleared
T
2
T
3
T
d
DMAC
cycle
T
d
T
1
CPU cycle
T
2
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