Hitachi H8S/2646 Hardware Manual page 733

A18–A0
CE
OE
WE
I/O7–I/O0
Note: Do not enable WE and OE at the same time.
Figure 20-19 Timing Waveforms in Transition from Memory Read Mode to Another Mode
Table 20-14 AC Characteristics in Memory Read Mode (Conditions: V
V = 0 V, T
SS
Item
Access time
CE output delay time
OE output delay time
Output disable delay time
Data output hold time
A18–A0
CE
V
IL
OE
V
IL
WE
V
IH
I/O7–I/O0
Figure 20-20 CE and OE Enable State Read Timing Waveforms
Memory read mode
Address stable
= 25°C ±5°C)
a
Symbol
t
acc
t
ce
t
oe
t
df
t
oh
Address stable
t
acc
Other mode command write
t
t
ces
nxtc
t
f
Min Max
— 20
— 150
— 150
— 100
5 —
Address stable
t
acc
t
oh
t
ceh
t
wep
t
r
t t
ds dh
= 5.0 V ±0.5 V,
CC
Unit
µs
ns
ns
ns
ns
t
oh
701