Sharp PC-4741 Service Manual page 53

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RC~Z~=~---------------------------------------------------------------
2) Sub CPU (SCM)
pin description ' , ,
"- - " . " ,
.
. ,
,-
..
Signal-hams-
:
, '
"
:
Pin
7,
,In/Out'
Function
,
IPCp PO
In/Out Bi-directions: Host IIF port '
IPef PI
InlOut "
IPC2,
P2
'In/Out,
IPC3 P3 ' InlOut
PVCRT
aDO Out CRT PoWer swiich
PVMOM aOI Olit
Not us'ad
PON(PVCC)
a02 Out
vee Power switch-
KSTRA ao3. ,Out
Key strqbe line
KSENO
ROO In
Key sense line (0 thrLJ 7)
KSENI ROI
In
KSEN2
R02 , In
KSEN3 R03
In
KSEN4
RIO
In
KSEN5 R11,
In
KSEN6
,R,12
In
,
KSEN7 R13
In
LEOI
R20
Out Caps Lock LED
LE02 R21
Out Num Lock LED
LED3
R22 Out
Scrl Lock LED
'RESET
R23
Out System Reset (active low)
FOND (SW7) R30
Out Not used
FONI (SW8)
R3t
Out Not used
COM1/2
R32 Out COM11"COM2 select
TKPOEW
R33 In
Ten-kay-pad select switch (High)
KSTRO
ZO Out
Key strobe line (0 thru 10)
KSTfll
ZI
Out (KSTROBEO=SLP/RES key strobe)
KSTR2
Z2 Out
(KSTROBEI =ON SW strobe)
KSTR3
Z3
Out
KSTR4
Z4
,Out
KSTR5
Z5
Out
;<STR6
Z6 Out
KSTR7
Z7 Out
KSTR8
Z8 Out
KSTR9
Z9
Out
(KSTROBE8, 9=Low Batt LED)
KSTR10
Z10 Out
(KSTROBE10=V-relerence)
CPUHS
ZII
In
Host hand shake signal
SCMHS
Z12 Out
SCM hand shake signal
BKLIGHT
Z13 Out Back-light control
KCLKOUT Z14
Out
KEY IIF clock out
LB
Z15 Out
Low Battery Signal lor HOD
KCLKIN KI
In
KEY IIF clock in
ON/OFF KH
In ONSWsense
KDATAIN
KL
In KEY IIF data in
LOWBATO KCO
An:OuVln
Low battery FATAL Level
LOWBATI
KCl
An:OuVln Low battery WARNING
level
ACPOWER
KC2
An: OuVln
AC adaptor
'RI
KC3
In
Ring indicator
KOATAOUT
SOUT
Out KEY IIF data out
SSPKR
F
Out Low Battery Beep.
VCCHK
SIN
In Vee check
.. means active-low signal.
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