z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 300

• Manufacturer Part Number: z80189
• Description: Z80180, Z8s180, Z8l180 Mpu Operation
• Manufacturer: ZiLOG Semiconductor

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UM005003-0703
Z8018x
Family MPU User Manual
RESET
Figure 94.
* 1. NORMAL: CPU executes instructions normally in NORMAL mode.
* 2. DMA request: DMA is requested in the following cases.
* 3. DMA end: DMA ends 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)
RELEASE
BUS
RESET = 0
Operation Mode Transition
NORMAL *1
REFRESH
DMA