Oki MSM85C154HVS, User Manual

Page: 228 / 378

ELECTRICAL CHARACTERISTICS
221
6.4 External Program Memory Access AC Characteristics
V
CC
=2.2 to 6.0V, V
SS
=0V, Ta=–40
°
C to +85
°
C
PORT 0, ALE, and
PSEN
connected with 100pF load, other connected with 80pF load
Parameter Symble Unit
Min. Max.
1 to 24 MHz
Variable clock from
41.7 1000 ns t
CLCL
XTAL1, XTAL 2 Oscillation Cycle
2t
CLCL
-40 — ns t
LHLL
ALE Signal Width
1t
CLCL
-15 — ns t
AVLL
Address Setup Time
(to ALE Falling Edge)
1t
CLCL
-35 — ns t
LLAX
Address Hold Time
(from ALE Falling Edge)
— 4t
CLCL
-100 ns
t
LLPL
Instruction Data Read Time
(from ALE Falling Edge)
1t
CLCL
-30 — ns t
LLPL
From ALE Falling Edge to
PSEN
Falling Edge
3t
CLCL
-35 — ns t
PLPH
PSEN
Signal Width
— 3t
CLCL
-45 ns
t
PLIV
Instruction Data Read Time
(from
PSEN
Falling Edge)
0 — ns t
PXIX
Instruction Data Hold Time
(from
PSEN
Rising Edge)
— 1t
CLCL
-20 ns t
PXIZ
Bus Floating Time after Instruction
Data Read (from
PSEN
Rising Edge)
— 5t
CLCL
-105 ns
t
AVIV
Instruction Data Read Time
(from Address Output)
0 — ns t
AZPL
Bus Floating Time(
PSEN
Rising
Edge from Address float)
1t
CLCL
-20 — ns t
PXAV
Address Output Time from
PSEN
Rising Edge
*1
*1 The variable check is from 0 to 24 MHz when the external check is used.