--
CE-1600E
(3) Signal Timing Chart
Moment when the power
is turned on or when the reset button is
pressed
(except when
@ffi
is pressed
after an auto-power
off.)
(4) Electrical Requirements
1.
Signal Levels
Input signal: TTL level
Output signal: TTL level (capable
of driving one TTL IC)
1/0
-1
EXPRM
t--Tt--I
2.
Input signal:
V
cc
DATA1-
.... _
x:---x
DATA8~~-
STROBE
Tl: approx. 20ms
T2: 1.5ms or more
T3: 1.5ms or more
T4: 15-20 µ.s
Output signal:
2.8K
M54514AP
or equivalent
Since all the outputs are through an open-collector,
a pull-up resistor
(approx.
1kn
-
10kn)
at
the
printer
is
required.
SHARP
recommended
printers al ready include a pull-up resistor.
8. Block diagram
Centronics interface
PC-l600
v« __
---!
vrc
ir
PC-l600
'-- __
..J
power supply circuit
EA-l60
(AC
adapter)
AAx5
(SUM3x5)
CE-I600F
(2.5"FDD)
11!Q
,---
1
...
PTI .PUI
.EZI
MINI.IORQ
MRQI.RDNI
WRNI
I'BO-7N
NU
RSTI--~----4_------~--~
Bu
: 8 bits
1/0
Buffer
I'CO-7N
Mu
: Mul t iplexer
FFl-3
: 8 bi ts
Latch
DCl-3
Decorder
INT
: Interrupt
circuit
RST
: Reset
cireuit
PAO-7I
: 8 bi ts
input
PBO-7N
: 8 bi ts output
port
PC 0-7 N : 8 bi ts output
port
~-----
,
- -- ---,-- - - - - - - - - - - . - - - f -
-f - .,
CSNO
107N
RSTN
GNU
vcc
[Fig.2) LR38045 block diagram gate array
