Z8S180 Zilog., Z8S180 Datasheet - Page 300

• Manufacturer Part Number: Z8S180
• Description: ENHANCED Z180 MICROPROCESSOR
• Manufacturer: Zilog.

284
UM005001-ZMP0400
Z 8018x Fam il y
M PU Us e r M anual
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