AM186ER-25KCW AMD [Advanced Micro Devices], AM186ER-25KCW Datasheet - Page 67

• Manufacturer Part Number: AM186ER-25KCW
• Description: High-Performance, 80C186- and 80C188-Compatible, 16-Bit Embedded Microcontrollers with RAM
• Manufacturer: AMD [Advanced Micro Devices]

COMMERCIAL AND INDUSTRIAL SWITCHING CHARACTERISTICS AND WAVEFORMS
In the switching waveforms that follow, several
abbreviations are used to indicate the specific periods
of a bus cycle. These periods are referred to as time
states. A typical bus cycle is composed of four
consecutive time states: t
which represent multiple t
Key to Switching Waveforms
3
1
Am186
, t
states, are referred to as t
2
, t
3
, and t
TM
WAVEFORM
ER and Am188
4
. Wait states,
TM
INPUT
Must be
Steady
May
Change
from H to L
May
Change
from L to H
Don’t Care,
Any Change
Permitted
Does Not
Apply
Invalid
w
ER Microcontrollers Data Sheet
states. When no bus cycle is pending, an idle (t
occurs.
I n th e sw i t c h i ng pa r a me t e r d e s c r i p ti o n s, t h e
multiplexed address is referred to as the AD address
bus; the nonmultiplexed address is referred to as the A
address bus.
OUTPUT
Will be
Steady
Will be
Changing
from H to L
Will be
Changing
from L to H
Changing,
State
Unknown
Center
Line is High-
Impedance
Off State
Invalid
i
) state
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