Sharp PC-1251 - Description of Keys

7
- - 7 . 0V
( M o t e ) vo i s =7 . 0V
( E X AMP L E .)
..,_ - 5 .6 V
- -4 . 2 V
- - 2 . BV
- - 1 . 4V
- a v
-
- ·
-
VA
~
VM
~
VB
'---
Retains the oft . atate .
Lt:
R E S ET ON
l
V DiS / 5
*
G ND -VAH - f
VM H - I
3
VBH - 5\ DiS V o t ; s / 5
VAL - t
v o . s ~ v .
- 5 - 5 DIS
VM L - t 1
v o i s
VDis · V s L - T
HA
P o w e r o tt
( C P U standb y )
Disp l ay on
80P in
bis
Disp lay o ut
• LCD ti m i ng c h a rt
~- - - --·- - - - - - . . · - --· - -- - - . - - -- -- ---- - ----- - - - - -·
Re ad / Wr i t e
( RAM F OR DISPLAY )
64 b y te 6 4 by te
( 40 - 7 F ) ( 00 - 3 F )
LCD display screen of 24 dig i ts is divided into two
se ct ions, H 1 - H 7 are used for the backplate
signal from the first to twelveth digits. H8 - H 14
ar e used fo r th e backplate s i gnal from the thir -
teenth digit to the twenty-fourth dig i t. Thus , the
L CD is operated in 1/14 duty.
V tn s
V A
M M
¢AL
Qj ) :
. ~ :
0 :
~ .
c •
<l) •
E :
Ol
<l)
l-- -- -+-- ( - S 6 ~ 2 ) ---i- ~ S 6 ~ 1 _____, ~
( S 63 ) S63
G N D V GG DIS H A
1 · - - - - - - 9- - -? - ~-
: ~
~ ----' --~
• L CD Dr i ver L Si (SC4353 6)
5. LCD DRiVE CiR C UiT AND TiMiNGS