4. DIGIT OUTPUT
OF
AA-100
PIN
NO.
of
AA-100
'8)1NT
I
I
2 3 4 5 6
I
I
:,
I
:1
@
Tl
I
I I
I
L
I
11
I
@
T2
I
I
I
I
.____.....__
_
__;_
____
-'--
_
__,!
I
I
@
T3
I
I
I
I
®
T4
I
I
I
I
I
@
T5
~
BLANX
PERIOO
1.67 x 6 =
IOmsec
Interrupt request
is
made at the repetition rate
of
1.67 msec by the gate oscillator connected to the
INT
terminal and interrupt processing
is
carried out.
Synchronized with this interrupt, digit output with
the timing
as
shown
in
Fig.
1-4
is
obtained at
Tl
to•
TS.
With the interrupts
of
1.67 msec each, the digit data
of
1
is
output for one bit only in the set
Tl
to TS,
and this
is
repeated 5 times. Then, every bit
is
pro-
vided with one
O section, and then this cycle
of
6
interrupts in total
is
repeated.
Fig.
1-4
Digit Output Timing Chart
All
the digits
of
key reading and dynamic fluorescent
display are specified by this digit data.
All
the O sections are provided at the
6th
section in
order to match the display
duty
cycle
of
the
tuner
micro-computer
AT-600, and no display
or
key
reading
is
available at this section. (AA-100
has
only
Tl
to
TS
while AT-600 has
Tl
to T6, and therefore,
one dummy section without
output
is
prc¥ided to
meet the
AT-600 duty cycle.)
------------SERVICE
MANUAL AA·R22/L,
AA-R32/L,.AA-R42------------
7
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