Z80180 Datasheet, PDF (300/326 Pages) Zilog, Inc. – Z8018x Family MPU

Z 8018x Fam ily
M PU Us e r M anual
284
RESET
RERSEESTE=T0= ₁
RESET = 0
RESET _{= 0}
NORMAL *1
EDnMdAofRDeMquAes*3t *2
BUSBRUESQRE=Q0= ¹
DMA
BUS
RELEASE
REFRESH
Figure 94. Operation Mode Transition
* 1. NORMAL: CPU executes instructions normally in NORMALmode.
* 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:
UM005001-ZMP0400