z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 303

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

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