Service manual

r PC 18X)
TABLE ·3
I PO " add, .,. I
T, bI . 1
lORa
.......
Om
"" ""
_ . ...,
"'
A> ". AS A<
., .., .,
..
OT
" '" '"
0' 0' 0'
00
, ,
0 0 0
0
0 0
0 0
,
Wr it. -.. to FFI
0
.
P, inter CA
P, lnn. sw R_
OO,,,,
'NT 'NT
FO I NT PF klY
PF k..,-
'NT
e ... lII,
e"obIt
, ......
' NT
'NT
, .....
,-
e", bI.
,
0 Reid dli' from FFI
, , , , , , , ,
0
0 0
,
0
,
RI .. I FD
'0
( ._w ll " "0" 1 Roo
,
0
AI"';! PA O-1
eMT
'01
P rinter Print
'0
R __
<X
input OR ON
'NT
PF k.y
" ''''
'
'''
0 0
,
0 0
,
W<IIt dill' to FFO
CMTln
R"T
R"T
MOlOr MOl or MOtor
MOlD'
(1SIlF""1 1 e ". bl.
0'"
ON
'0
" "
,.
,
0
RIM! dltllrom FFE
, , , ,
,
• •
•
(1fiC)-"'71
0 0
,
,
0
•
~Sh " ~j to FFE
M OIO<
"O M
"0_
Motor Motor Mot or
Mo_
MOlor
, -
"
YO YO
VA
,.
"
"
,.
,
0
Read ",-" f rom FF3
• • • • • • • •
"""""
NOTE: Abov •• r •• 11 high ICtiV' IS seen from tn. CPU side, txeept thlt FO reset is low IC t iv •.
• Gat e array (LR38046) pin description
Pin
Symbol
I/O
Active
lIveilit ,eset
Description
No.
' w.
,-a
PC7N - P CON n" Lo. Hi gh 8-b it ou tput port (port .ddresl: 83H I-
DO - 07 COfre5pond to PCO - 7N v ii FF3 '
9 -16
P87N - P BON n" Lo. High a-bit output po rt (pOrt add r ess: 82H).
DO - 07 correspond to PSO - 7N via FF2.
17
INC)
18
PU'
"
(L ow )
PU signal input.
[ Used for cr Ntio n of 8 32KB ROM signal J
"
PT'
"
(High)
PT signal
input.
(CSNO).
20
EZ'
"
(High)
EI'H sig na l input .
"
MI NI
"
(High)
Ml
si gnal Inp ut. [ Used fo r crllllon of lhe I0 7N and gate
1
22 IOAO
"
High I OAO signal Input. array intarnal enable signal.
23
MAOI
'"
High MAEQ II gnal input l used for genel'llion of CSNO).
2' R ST'
'"
H igh Reset signal input.
When the I'Iset signal Is received on t his line, it Issues t he internal
flipfl
op reset signal 8 1'K1 ASTN (2 .6" F CD reset signat).
2. vee
!
Power supply.
2.
GNO
27
'RQ n" L ow
Hi gh impedance IntelTUpt tignal OUtput.
Th e OUtpUI is N<fIannel ope n drain 1YP& and il pulled up to vce
on the f>C.1600 slda.
2. ADN I
"
Lo. RD signal input .
29 WANI
'0
L ow WA signal input.
30-39
.4.01- .4. 71
'0
Address input.
A1 41 , A1S I
.0
(NC)
41
RSTN n"
Low L ow 2.5" F 00 reset slgnel outPut.
The active s tete of th e signal is unconditionally Issued with a reset
signal
end It must be cleared bV mean. of software. It is also pOlS l b1e
to create the signal bV .a hwilre . (Addnm : 81H, DO , WA)
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