If data is found, it is tested for validity, and the required "end of tune" condi-
tions will be sensed by the RF sensors. Then the data will be latched in place,
and the CPU will again return to the "STOP" mode. This process takes about 20
milliseconds, which is the same length of time that is required to close the net-
work relays.
7
7 .. 1
1 4
4 II N
N II T
T II A
A L
L II Z
Z A
A T
T II O
O N
N
The microcomputer is usually in the STOP mode and requires an interrupt sig-
nal (IRQ) to start program implementation. The IRQ is obtained from the RF
sensor network as follows: The positive output from the FORWARD power
detector is buffered through Q4 and IC-3C and applied as a positive logic "1" to
NAND gate IC-4C. The resultant output to NAND gate IC-4C is logic "0". This out-
put, which is directly connected to the IRQ request input of the CPU, will acti-
vate the computer and after the initialization process, begins to implement the
control algorithm tuning.
7
7..1
15
5 IIN
NF
FO
OR
RM
MA
AT
TIIO
ON
N R
RE
EA
AD
D
The data sensors are interfaced with the CPU through input ports PA3 through
PA7. After an IRQ, the tune algorithm program can access any desired vari-
able by simply searching for the desired input port (lacking any applicable
pre-stored data). Since the comparators effectively preprocess the desired
data, to read any specific variable, the CPU need only look at the required port
for the desired variable.
7
7..1
16
6
S
ST
TO
OR
RIIN
NG
G M
ME
EM
MO
OR
RY
Y
When it is necessary for the associated RF tuner parameter to be changed, it
writes the desired data into the series to parallel buffer, 1C9. This is done by
out-putting the desired status of the network relays in a serial data stream
from PAO on the CPU. Clocking is derived from PA1. If, for example, it is
desired at some time in the tune-up sequence to increase the inductance by
one binary increment, the CPU examines the binary number representing the
status of the L control relays, decrements that number by one and clocks that
number, one bit at a time into the register in 1C9. In order to increase the
inductance, it is necessary to decrease the binary number in the CPU register.
A data 1 equals a CLOSED relay which in turn, equals a shorted conductor.
Similarly, the CPU is able to manage the bits which control the input and
output C banks.
53
© 1998 SGC Inc
SG-230 Manual
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA 98005 USA
P.O. Box 3526, 98009 Fax: 425-746-6384 Tel: 425- 746-6310 or 1-800-259 7331
E-mail: [email protected] Web site: http://www.sgcworld.com