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10.2.2
Reset Circuit
The reset circuit is provided to initiali ze the CPU HD6
303X
(IC101
).
About
30
0m-
sec
aft er the
+
5V is
supplied
to
IC101
,
the reset signal on pin
@
of IC104 changes fr om L
to
H:
.
_
In the stand ing state 0102 is turned on because of D111 and R115
volta ge
d1
v
1d
er, an
d
0 103 Is
not turn ed
on.
When power is supplied
to the
circuit, 0103
is
turned on
befo
re 010
2.
When 0102 is turned
on,
010
3's
collector,
chang
es s low
ly from L
to
H
beca use capacito
r
C
108 is not
charged
.
.
_
After stabilization of the
+
5V
by the
time constant R117
,
R11
8
an
d
C10
8, t he pote
nti al of pm
®
of
IC 104
increase
s
and when it is larger than threshold level of pin
@
,
pin
@)
of
IC
104 chang
es
fro
m
L to
H
. The
output of this delay circuit
is
sent to IC101 and the r~set operation
is perfo
rm
ed.
.
_
When the voltage
drops,
and current is Low
,
0103
1
s turned on
beca use
01
02 Is
not turn ed
o
n
.
Sme
e
0103 is turned
on,
the charge accumulat ed on C108
is quick
ly
released. A lso
th
e
potential of pin
@
is
smaller than threshold level and pin
@
changes from H to
L.
Circuit Diagram
Timing Chart
0102
base
IC104
pin
®
IC104
pin
@
+SV
+SV
+
5V
(ON)
+
5v
IC
10
4
GATE
ARRAY
+
5v
31
RSET
ZI04
CPUR
1-'
4
=
5
-
--
-
Rese
t
pu lse to CP
U
0112
I
CI06
(O
FF
)
base
threshold
leve
l
(a bou
t
2 .5V)
-
24
-
10.
2.3 C
PU and
Gate
Arra
y Ci rcuit Block
(1)
Thi
s bloc
k
consists
mainly of CPU (IC101)
,
ROM (IC102
),
RAM and the Gate Array (IC 104
).
Th
is
secti on receives data from the keyb oard or the host
co
mput
er
and
proc
ess es th
e
input from the
variou
s se nsors
and operation swit
ches, it
also controls the pap
er
feed,
ca
rriage
, co
rrect motor
s,
th
e
thermal head
and
th
e
Head
press
solenoid.
CPU
RD
wFi
A15
I
Address
Bus
AO
D7
I
V
Data Bus
"-I
DO
E
•
Home
Sensor
K=)
(KX-W60TH only)
•
Moto
r
• Int
erface
•
LED
•
Buzzer
l
Paper out
Sensor
I
I
~
~
Address
input
-
,.__
-
,.__
Data ou tput
r---.
OE
~
~
Address
r-i/
inp
ut
~
~
Data
~
input.>o utp
ut
I--
r--
~
-
r--
Wt
r---
-
--
-,
-
f---:----1
cs
I
I
I
Address
I
L
I
input
I
MD
ata
I
I
~
I
inpuVoutpu
t
L
I
1-
I
t--
r----►
i
OE
I
I
~
I---
~
we
I
L
__
_
___
_j
~
Address
input
~
Data
✓
inpuVoutput
-
·
WR
RAM2
RAM1
ROM
E
Home
Sensor
(KX -W
SO
TH
on
ly)
-
25-
IC102
ROM
(IC103
)
[IC301]
RA
M
(
)=
KX-W50TH
[
]
=KX-
W 60TH
[IC302]
EX
PAN
S ION
RA
M
(KX-W6
0TH
only)
IC 104
GAT
E A
RRA
Y
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