Panasonic KX-B620 - Gate Array

KX-B620 Series
KX-B520 Series
Timing
chart
is
as
follows:
VCC (+5V)
(Power “on” Delay)
5th Pin of |C101
RESET
Fig. 13 Timing Chart of Power sequence
2-3 Gate Array (10103)
1) Function
This
gate
array
is
divided
into
five
section
expediently.
Equivalent circuit of this gate array is Fig 15.
2) Circuit Operation
@ Oscillator section
The
4
MHz
clock
is
produced
and
supplied
to
CPU
and
internal
clock
generation
circuit.
[4
Fig. 14 Equivalent Circuit
@® Interrupt Signal (INT) generation section
This signal is a start signal of 1 line sequence.
it
is
made
from
CCO
software
produced
signal
from
CPU.
It
is
sampled
by
250
kHz
clock
and
synchronized
with
hardware
timing.
It
interrupts
CPU
and
makes
it
start
1
line
sequence.
For
example,
the
thermal
head
strobe
signals
and
latch
signal
are
produced.