Zilog Z80180 Manuel d'utilisateur Page 300

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Vue de la page 299
Z8018x
Family MPU User Manual
284
UM005003-0703
Figure 94. Operation Mode Transition
* 1. NORMAL: CPU executes instructions normally in NORMAL mode.
* 2. DMA request: DMA is requested in the following cases.
–DREQ0
, DREQ1 = 0
memory to/from (memory mapped) I/0 DMA transfer
b. DEO = 1 (memory to/from memory DMA transfer)
* 3. DMA end: DMA ends in the following cases:
DMA
NORMAL *1
RESET
REFRESH
BUS
RELEASE
B
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RESET = 0
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