Sharp CE-E, Service Manual

Page: 5 / 16

·_
CE-1600E
10RQ Address
Data
MI A7
A6 AS A4 A3 A2 Al AO
WR IID
Operation D7 D6 05 D4 D3 D2 01 DO
1
1 0 0
v------
FD INT
l-----
--
0 0 0
0
0
0
1 FFI data write
0 *
-----
---
Enable
1 0 FF 1 data read 1 1 1 1 1 1 1 1
FD reset
0 0 0 1 0 1 FD Reset
(0: re set)
PAO-7read
.>
(0 ) (0) (0)
Comparator
Vp LB
Centronics
1 Q FD INT
LB BUSY
FF2(~)
-:
Centronics Centronics I----
--
0 0
1 0 0
I Pullup
~
data write
iNiT "STJm!it
--
1 11
FF2(~)
1 1 1 1 1 1 1 1
data read
0
FF3(~)
Centronics ~entronics Centronics Centronics Centronics Centronics Centronics Centronics
0
1 1
0
1
data write DATAI DATA2 DATA3 DATA4 OATAS DATA6 DATA7 DATA8
1
0
FF3(~)
1 1 1
1 1 1
1
T
data read
NOTE: All
are active high (1: active, 0: inactive) as seen Irom the
CPU,
except lor
FD
reset (0: active).
© LR38045 gate array signal description
PIN No.
Pin name
1/0 effective Highlow at reset
Descriltion
1-8 PC7N-PCON
Out low High
8-bit output
port
(port address 83H)
00-D7 corresponds to PCO-7N via FF3.
9-16
PB7N-PBON Out
low High
I-bit output port (port address 82H)
00-D7 corresponds to PCO-7N via FF2.
17
(NC)
18
PUl In (Low)
PU input
[ Used to create 32KB ROM select signal (CSNO).
J
19
PTI
In
(High)
PT input
20 EZI
In (High)
Eminput
21
MINI In (High)
MI irclut
[~ed to create 107N and gate array interna! enableJ
22
10RQ
In High IORQ input
Signals.
23 MRQI
In High
MREQ input (used to create CSNO).
24
RSTI In High
Reset input. When the reset signal is entered, the intemal ~1Iop is reset
and RSTN (2.5' FDD reset signal) is sent out.
25
Vcc
.
26
GND
) Power supply
27 IRQ
Out
Low High Z
All N-cIW1nel
open
drain interrupt signal output wtich
is puIed ~
toVCC
on
the
PC-1600 siele.
28
RDNI
In low
Jm"input
29 WRNI
In
low WR"input
30
I
AOI- A71A141, A1SI In
Address input
39
40
(NC)
2.5' FDD reset
signal
output.Sent out lIlCOIidiliolfilly
with the
reset signal
41
RSTN
Out low low
and must
be
canceled by means of software. It is
possble
to send out
softwarewise. (Address 81H, 00,
WR")
42
107N
Out low (High)
2.5' FOD select signal.
(SenT out
via
address 70H-7FH.)
43
CSNO Out
low (High)
321<8ROM select signal.
rm
MREQ. PT············High
pU·····················low
Address········· ···4000H -7FFFH
(PV"'low; Centronics interface, High; FDD)
44-51
DBO-DB7
ln/Out
(8-bit) data input and output.
52
I
PAOI-PASI
In
low
Il1lut
port
(port address 81H)
57
PAD-61 corresponds to DO-6.
60 PA61
(Interrupt controled by FFI (address 80H) output 00-6.)
58
GNO'
Power supply
59
(NC)
61
PA7B
Out
High
62
PA7N
(Out)
64
PA71
In
High
63
(NC)