z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 267

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

Bus Control Signal Conditions
BUS AND CONTROL SIGNAL CONDITION IN EACH MACHINE
CYCLE
Table 51.
Instruction
ADD HL,ww
ADD IX,xx
ADD IY,yy
ADC HL,ww
SBC HL,ww
Bus and Control Signal Condition in Each Machine Cycle
Machine
Cycle
MC1
MC2
~MC5
MC1
MC2
MC3
~MC6
MC1
MC2
MC3
~MC6
* (ADDRESS) invalid
Z (DATA) high impedance.
** added new instructions to Z80
States
T1T2T3
TiTiTiTi *
T1T2T3
T1T2T3
TiTiTiTi *
T1T2T3
T1T2T3
TiTiTiTi *
Address
1st Op Code
Address
1st Op Code
Address
2nd Op Code
Address
1st Op Code
Address
2nd Op Code
Address
Data
1st Op
Code
Z
1st Op
Code
2nd Op
Code
Z
1st Op
Code
2nd Op
Code
Z
RD WR MREQ
0
1
0
0
1
0
0
1
1
1
1
1
1
1
1
1
Family MPU User Manual
0
1
0
0
1
0
0
1
IORQ M1 HALT ST
1
1
1
1
1
1
1
1
UM005003-0703
0
1
0
0
1
0
0
1
1
1
1
1
1
1
1
1
Z8018x
0
1
0
1
1
0
1
1
251