Figure 8-16 shows the timing when the DMAC is activated by the falling edge of
DREQ
in normal
mode.
Figure 8-16 Timing of DMAC Activation by Falling Edge of
DREQ
in Normal Mode
ø
DREQ
RD
HWR
T
2
T
1
T
2
T
1
T
2
T
d
T
1
T
2
T
1
T
2
T
1
T
2
T
d
T
1
T
2
LWR
,
CPU cycle
DMAC cycle
CPU
cycle
DMAC cycle
Minimum 4 states
Next sampling point
Address
bus
228
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