z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 182

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

BUSREQ
BUSACK
MREQ
IORQ
Phi
M1
Phi
E
E
NOTE : MC = Machine Cycle
Figure 67.
Figure 68.
Fetch Cycle
T1 T2 T3
Op Code
state
Last
Memory Read/
T1
Write Cycle
E Clock Timing Diagram (During Read/Write Cycle and
Interrupt Acknowledge Cycle
E Clock Timing in BUS RELEASE Mode
T2
TX
T3
T1
TX
I/O Read Cycle
T2
E
Tw
BUS RELEASE mode
E
T3
E
T1
I/O Write Cycle
T2
* Two wait states are automatically inserted
Family MPU User Manual
T3
NMI
Acknowledge
1st MC
T1
TX
T2
T3
TX
T1
UM005003-0703
INT0 Acknowledge
1st MC
T2
Tw*
Z8018x
Tw*
T3
167