Z80180 Datasheet, PDF (267/326 Pages) Zilog, Inc. – Z8018x Family MPU

Z8018x Family
MPU User Manual
251
Bus Control Signal Conditions
BUS AND CONTROL SIGNAL CONDITION IN EACH MACHINE
CYCLE
* (ADDRESS) invalid
Z (DATA) high impedance.
** added new instructions to Z80
Table 51. Bus and Control Signal Condition in Each Machine Cycle
Instruction
ADD HL,ww
ADD IX,xx
ADD IY,yy
ADC HL,ww
SBC HL,ww
Machine
Cycle States Address
Data
MC1
MC2
~MC5
MC1
MC2
MC3
~MC6
MC1
MC2
MC3
~MC6
T1T2T3 1st Op Code 1st Op
Address
Code
TiTiTiTi *
Z
T1T2T3 1st Op Code 1st Op
Address
Code
T1T2T3 2nd Op Code 2nd Op
Address
Code
TiTiTiTi *
Z
T1T2T3 1st Op Code 1st Op
Address
Code
T1T2T3 2nd Op Code 2nd Op
Address
Code
TiTiTiTi *
Z
RD WR MREQ IORQ M1 HALT ST
010
1
01
0
111
1
11
1
010
1
01
0
010
1
01
1
111
1
11
1
010
1
01
0
010
1
01
1
111
1
11
1
UM005001-ZMP0400