Z86C90 Datasheet, PDF (8/14 Pages) Zilog, Inc. – ROMLESS CMOS Z8 8-BIT MICROCONTROLLER

AC CHARACTERISTICS
External I/O or Memory Read and Write Timing Diagram
R//W
Port 0, /DM
Port 1
/AS
/DS
(Read)
Port1
/DS
(Write)
13
12
19
A7 - A0
1
2
16
3
4
5
17
A7 - A0
14
D7 - D0 IN
9
8
6
18
11
10
D7 - D0 OUT
15
7
External I/O or Memory Read/Write Timing
8