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TRC-70
116
MAT-100 (AUTOMATIC ANTENNA TUNER)
« CPU standby operation and interface
The STBY signal is low and the CPU stops the clock
oscillation,then enters the standby mode. When a TS
or TT signal is set low in the standby mode, the TS
signal sets the STBY signal high using O04, IC16 (3/4),
and IC 16 (2/4). The TT signal sets the STBY signal high
using O6, IC16 (1/4), and 1C16 (2/4).
The MAT-100 then exits the standby mode. When
the STBY signal is set high, it is delayed by the time
constant of R55 and C29, and pin 2 of IC14 is set high.
When this terminal is set high, a reset signal (low) of
the duration determined by C38 is output from pin 5.
When the reset signal is set high, the CPU starts
operation.
1C4 checks the P35 and P37 outputs, that
is, the Q4 and Q6 outputs and judges whether the
Power
on
vy
©
*—
50 ms —*}
Tuning start on
Vv
STBY
we —_____—-
Clock stop ———
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if
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3 ms
RESET
i
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t
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{
i
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{
{
{
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I
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[
i
+
I
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I
Reset
|
Initializing
Standby mode
I
!
| Reset
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Initializing
Tuning start
Fig. 10 Tuning start
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