Fostex B-16 - Page 19

this input pin is at "H" level. In other words, the BCD codes,
RA through R d representing the number that is output, is stored
in the register.
EQUAL : A signal is output here whenever the values of the register and
counter agree .
5) Area output for ZERO RTN
As the specifications for this system are as presented in 4-1, item 3,
above, outputs for middle speed area and low speed area are required. The
middle speed area are set to ±1 minute and the low speed area to ±10 seconds.
The circuit for this operation is shown in Fig. 4.6 and the timing chart in
Fig. 4.7.
±10 second is detected by U31 and ±1 minute is output by storing one minute
in the U23 memory, then setting the U26-13 flip flop by the equal output
from U23-23.
Fig. 4.6
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