Status signals, Pin outputs in each operating mode, Status signals 287 – Zilog Z80180 User Manual
Page 303: Table 55
Z8018x
Family MPU User Manual
287
UM005003-0703
Status Signals
PIN OUTPUTS IN EACH OPERATING MODE
Table 55 describes pin outputs in each operating mode.
Table 55. Pin Outputs in Each Operating Mode
Mode
M1 MREQ IORQ RD WR RFSH HALT BUSACK ST
Address
BUS
Data
BUS
CPU
Operation
Op Code Fetch
(1st Op Code)
0
0
1
0
1
1
1
1
0
A
IN
Op Code Fetch
(except 1 st Op
Code)
0
0
1
0
1
1
1
1
1
A
IN
MemRead
1
0
1
0
1
1
1
1
1
A
IN
Memory Write
1
0
1
1
0
1
1
1
1
A
OUT
I/O Read
1
1
0
0
1
1
1
1
1
A
IN
I/O Write
1
1
0
1
0
1
1
1
1
A
OUT
Internal
Operation
1
1
1
1
1
1
1
1
1
A
IN
Refresh
1
0
1
1
1
0
1
1
*
A
IN
Interrupt
Acknowledge
Cycle
(1st Machine
Cycle)
NMI
0
0
1
0
1
1
1
1
0
A
IN
INT0
0
1
0
1
1
1
1
1
0
A
IN
INT1, INT2 &
Internal
Interrupts
1
1
1
1
1
1
1
1
0
A
IN
BUS RELEASE
1
Z
Z
Z
Z
1
1
0
*
Z
IN
HALT
0
0
1
0
1
1
0
1
0
A
IN
SLEEP
1
1
1
1
1
1
0
1
1
1
IN