AM186 Datasheet, PDF (89/112 Pages) Advanced Micro Devices – High-Performance, 80C186- and 80C188-Compatible, 16-Bit Embedded Microcontrollers with RAM

Interrupt Acknowledge Cycle Waveforms
t₁
t₂
t₃
t₄
t_W
CLKOUTA
68
A19–A0
Address
7
8
S6
S6
S6
AD15–AD0*,
AD7–AD0**
12
1
2 ^(b)
Ptr
15
AO15–AO8**
ALE
BHE*
Address
23
9
10
11
BHE
INTA1–INTA0
DEN
22
DT/R
S2–S0
Notes:
D
20
19 ^(c)
22
A ₃
R ^Status
* _{Am186ER microcontroller only}
** _{Am188ER microcontroller only}
F T4
31
21
4 ^(a)
22 ^(d)
a The status bits become inactive in the state preceding t₄.
b The data hold time lasts only until the interrupt acknowledge signal deasserts, even if the interrupt acknowledge
transition occurs prior to t_CLDX (min).
c This parameter applies to an interrupt acknowledge cycle that follows a write cycle.
d If followed by a write cycle, this change occurs in the state preceding that write cycle.
Am186^TMER and Am188^TMER Microcontrollers Data Sheet
89