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Terminal
Terminal
Input/
Explanation of signals
No.
name
Output
1
Vss
Power
supply
ov
2
RES
Input
Power ON reset input terminal
3
INT
Input
Interruption input terminal when a low battery is detected.
(In general, high level, when LB is detected, low
level)
4
STBY
Input
Pull-up and fix to
Vee.
•
5
XTAL
Input
4 MHz oscillator connection terminal
6
EXT AL
Input
4 MHz
oscillator
connection terminal
7
NUM
Input
Pull-up
to Vee
at 10 K!1.
8
TIMER
Input
Fix to GND
=
OV.
9
PA7
Output
Paper feed (Y) motor D phase start signal
10
PA6
Output
Paper
feed (Y)
motor
C phase start signal
11
PA5
Output
Paper feed (Y) motor B phase start signal
12
PA4
Output
Paper
feed (Y) motor A phase start signal
13
PA3
Output
Carriage feed (X) motor D phase start signal
14
PA2
Output
Carriage
feed (X) motor C phase start signal
15
PA1
Output
Carriage feed (X) motor B
phase
start signal
16
PAO
Output
Carriage feed
(X) motor
A
phase
start signal
17
PB7
Output
SID
"RD" signal
18
PB6
Output
SIO
"CS" signal
19
PB5
Output
PRINT+->
external SIO select signal
(buffer IC
enable
signal)
20
PB4
Output
Print
signal, when the
head
drive
signal is generated, low
level.
21
PB3
Output
Head pin drive
(yellow)
signal,
high level
is
available.
22
PB2
Output
Head pin
drive
signal
(mazarine)
signal,
high level
is avilable.
23
PB1
Output
Head pin drive
signal
(cyanic) signal, high level is
available.
24
PBO
Output
Head pin drive (black)
signal,
high level is available.
25
PC7
-
N.C
I
I
-
I
27
PC5
-
N.C
28
PC4
Input
Carriage
home
position
detection
signal.
Only the home
position
is
at high level.
• SC6305Y1 is a single chip micro computer of 8 bits.
(Internal
ROM=
7872 bits, RAM= 256 bytes, extension of an external 8K byte RAM is possible.)
6. EXPLANATION OF CPU TERMINAL SIGNALS
Fig. 6 Circuit section C in the block diagram
The logic voltage Vee is generated with Vp voltage. Since
the Vp
varies
from 5.5V to 6.5V when a printer is operated
and varies from 6.5V to 7.7V while charging,
the
zener
charactristics are used. The stabilization
of activation at
starting time is accomplished with C1, R1 and 01 which
have the same charactristics as the of
C1,
R 1 and 01 in
circuit A.
R4
D2
R2
Tr1
Vp ~--
..... ------.
,----41------...-----.,l
J
Vee
•
Section C: Vee power supply circuit
-
CE-140P
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