Sharp PC-1251 - CHAPTER 1. HOW TO USE THIS MANUAL

5
Pin Si gna l
IN/ O UT
De s cr i p ti o n ( Standby = pow e r off )
No .
name
1 3 i A8
IN / OUT
K e y input/strobe si g na l , l ow d uring standby and k e y - i n pulse is genera ted when low .
14 i A7 I N /OU T
Key input / str o be si g na l , l ow d uri n g s t andby and key-in pulse is gener at e d w h en low .
15
i A6
I N / OUT Key input/strobe s i gnal , lo w d u r i n g s t andby and key - in pulse is ge n er ate d when l ow .
16 iA5
IN / OUT Key in put /st ro be sign a l , l ow d u ri ng standby and ke y -in pulse is ge n er ate d w h en low .
17
i A4
IN / OUT K e y i np ut /st ro be s i gnal , l ow du ri ng standby and key-in pulse is gene r at ed w h en l ow.
18
i A3 IN / OUT Key in p ut / st ro b e sign a l, low d uri ng s tandby and - key-in pulse i s genera ted when l ow.
19 iA2 I N/ OU T K e y input / strobe signal, lo w durin g standby an d key - in pul s e is ge n era ted when l ow .
20 iA1 IN /O UT K ey i nput/s t r ob e s ig nal, lo w du ri ng standby and key-in pulse is genera t e d w hen l ow.
21
iB8 IN
ACK sig na l that e n ables the CP U to r e ad data through 1 / 0 port ( PCU).
22 i B7 IN
Dat a in (Din) . S e r ial d at a i np u t fr om PCU (bit by bit se rial ha ndshake).
23 iB6
OUT
SEL2 o utput, P - ty p e open drain.
24
i B5 OUT
S EL 1 output, P -type open drain .
25
iB4
I N
S lide switch input.
26 iB3 OU T
Key strobe o utput, low dur i ng stan db y a nd key - in pulse is gen erat e d when low .
27
iB 2 OUT
Key s trobe output , l o w dur i ng s tandb y and key-in pulse is g enerated when low .
28 iB 1 OUT Ke y st r obe outpu t, low during standby a nd key-in pulse is ge ne ra ted when low .
29 VM IN
LCD po wer su pp l y .
30 VA IN
L CD powe r supply .
31
GND IN
Powe r supply.
32 H1
O U T
LC D
b ac k plate signal ,
h i gh
i mpeda n ce
duri ng st andby ' and 4 - level pulse
d u ring di sp la y .
33 H2 O UT
L CD
bac kplate si gn al,
hi gh
i mpedan c e during
s t and b y
an d 4 - le ve l pulse d ur ing dis play .
3 4 H3 OUT LCD
b ackp late sign a l ,
high
impedan c e
during s t a n db y a nd
4 - leve l pu l s e during display .
35
H4
OUT LCD
b a c kplate signa l ,
high
impedance
d ur in g sta nd by
an d 4- l e v el
puls e
during di s play .
36 H 5 OUT LCD
b ackplate s i gnal ,
high
i mped a n ce d u r i n g
stan d by and
4-level pulse during display .
37
H6 OUT LCD
back p la te signal,
high
i mpedance
d u ri ng sta ndby
and 4 -l eve l pulse during display .
38 H7 OUT LCD backpl at e si gna l ,
high
i m p edance d uring standby and 4 -l evel pulse during di spla y.
39
H8 OUT L C D
backplate sig n al,
h i gh
impedance duri ng
s ta ndby
and 4 -l evel pulse d u ring dis p lay.
40
H9 OU T LCD
backplate sig n al,
high
i m p e d a nc e
d u r i n g s t andby and
4- l eve l pulse d u ring display .
41
H10 OU T LC D
bac k plate sign a l ,
hi g h
impe d a n ce
during standby and 4 -l evel pulse duri ng
dis play .
42 H 1 1 O UT
LC D
ba c kplate s i g nal ,
hi gh
im pe d an c e
during s tandby
and 4- l evel pulse dur i ng dis play.
43
H12
OUT LCD
backplate signal ,
high
impedanc e
duri n g stand by and 4-level pulse during
dis p l a y .
44
H13 OU T LCD
backplate signal, high impedance
duri n g sta ndby and 4 - l e vel pulse
during di sp l a y.
45
H14 OU T
LCD
backplate signal ,
high
impedance d u ring
s ta nd b y
and 4 -le ve l pulse du ring displ a y.
46 H15
--
No t used. ( D isp l ay of t his unit o p erat es i n 1/ 14 duty. )
47
H 1 6
- -
N o t u sed . ( D isplay of th i s un i t o p e ra tes in 1 / 14 duty.)
48
Vs
I N
L CD power supply , high during standb y a nd low when the high level cl ock sto p s .
49
V D i s
IN
LCD po w er supply, high d u rin g stan dby and low when th e high level c l o c k stops.
50
Vee
IN
LC D power supply, norm a l l y low .