z80180 ZiLOG Semiconductor, z80180 Datasheet - Page 23

• Manufacturer Part Number: z80180
• Description: Microprocessor Unit
• Manufacturer: ZiLOG Semiconductor

PS014004-1106
IOC—
IOC = 1
When
IORQ
WR
and
This bit controls the timing of the
M1
IOC = 0
, the
f
Figure 12. I/O READ and WRITE Cycles with IOC = 0
Figure 11. I/O READ and WRITE Cycles with IOC = 1
RD
IORQ
IORQ
WR
IORQ
RD
WR
RD
, the timing of the
signals go active as a result of the rising edge of
φ
T
φ
Figure 10. M1 Temporary Enable Timing
1
and
WRITE into OMCR
T
RD
T
1
1
T
signals function the same as the Z64180
2
T
IORQ
T
2
2
T
3
and
IORQ
T
RD
T
W
W
T
1
and
signals match the timing of the Z80. The
Opcode Fetch
RD
T
T
3
signals. It is set to
3
T
2
T2
T
3
(see
(Figure
Microprocessor Unit
Figure
1
by
11).
RESET
12).
Architecture
Z80180
. When
17