S0
S1
S2
S3
S4
S5
S6
S7
CLK
6A
FC2–FC0
8
6
A23–A0
AS
7
12
15
14
9
13
11
9
11A
20A
20
22
14A
LDS / UDS
17
18
21
R/W
28
21A
55
47
DTACK
26
23
53
25
7
48
DATA OUT
47
30
BERR / BR
(NOTE 2)
47
47
32
32
56
HALT / RESET
47
ASYNCHRONOUS
INPUTS
(NOTE 1)
NOTES:
1. Timing measurements are referenced to and from a low voltage of 0.8 V and a high voltage of 2.0 V,
unless otherwise noted. The voltage swing through this range should start outside and pass through the
range such that the rise or fall is linear between 0.8 V and 2.0 V.
2. Because of loading variations, R/W may be valid after AS even though both are initiated by the rising edge
of S2 (specification #20A).
Figure 10. MC68SEC000 Write Cycle Timing Diagram
M68000 USER’S MANUAL ADDENDUM
MOTOROLA
15
MOTOROLA [ MOTOROLA ]
