If the above conditions are not satisfied, the inter-
nal reset circuit will not operate normally. In such a
case, the LCD unit must be initialized by executing
a series of instructions (see the Execution by In-
structions section).
t
AS
PW
EH
t
DDR
t
cycE
t
AH
t
AH
V
OH
V
OL
DB
0
- DB
7
t
Ef
t
DHR
t
Er
V
IH
V
IL
E
V
IH
R/W
V
IH
V
IL
RS
VALID DATA
LCD27-25
Figure 6. Read Operation Timing Diagram
(For data sent from the LCD unit to the external microprocessor)
3$5$0(7(5
6<0%2/
9$/8(
81,7
0,1
0$;
(QDEOH &\FOH 7LPH
W
F\F
(
QV
(QDEOH 3XOVH :LGWK +LJK /HYHO
3:
(+
QV
(QDEOH 5LVH)DOO 7LPH
W
(U
W
(I
QV
6HWXS 7LPH
56 5:(
W
$6
QV
$ROG 7LPH
W
$+
QV
'DWD 'HOD\ 7LPH
W
''5
QV
'DWD +ROG 7LPH
W
2+5
QV
Table 10. Read Operation Timing Characteristics
(V
DD
= 5.0
±
5%, V
SS
= 0 V, Ta = 0 ~ 50
°
C)
3$5$0(7(5
6<0%2/
9$/8(
81,7
0,1
7<3
0$;
9ROWDJH %XLOG8S 7LPH
W
UFF
PV
3RZHU2II 3HULRG
W
2))
PV
Table 11. Power Conditions for Internal Reset
0.1 ms
≤
t
rCC
≤
10 ms
t
OFF
≥
1 ms
0.2 V
0.2 V
0.2 V
4.5 V
NOTE: * t
OFF
indicates Power-off Period.
V
DD
LCD27-26
Figure 7.
Dot-Matrix LCD Units
20
Display Unit User’s Manual
