Casio MG-500 - Page 16

6 INTERNAL CIRCUITS OF GATE ARRAY F
(1) Frequency Detection Counter
In
order
to
detect
the
frequency
of
strings’
vibrations,
sexadecimal
counter
in
Gate
Array
F
counts
up
the
positive
and
negative
portions
of
the
waveform
from
the
strings,
and
provides
digital
data
to
CPU
via
data
bus.
SER
seetetan
Seeiaey
ADO~7
KXRE ROOST
BRKT.
SKE
KKK
1
sicz
‘Signal from the Same circuit os above
2nd string
|
Mr Za
Jy
sic4
1
Signal
from
the
Some
circuit
as
above
4th string
sis
u-
Signal trom the
Sth string
=f
siss|
Signal from the tt
6th string
1
Lu
—
AO~3
0
Decoder