Main
micro
circuit
page
2
The
main
micro
at
location
IC107
(on
the
diagram
this
is
split
into
two
area
these
are
micro
power
and
config
+
Micro
I/O)
we
will
deal
with
Micro
power
and
config
1
st
.
Micro
power
and
config
Two
separate
power
supplies
are
required
by
the
AT91SAM
these
are
taken
from
3V3
and
1V8
for
the
processor
core
–
the
micro
is
programmed
with
bespoke
Arcam
code
the
oscillator
for
the
micro
is
at
X101
and
runs
at
4MHz
the
TDI
TDO
TCK
TMS
ERASE
NRST
pins
are
for
development
Debug
use
and
the
connecter
at
location
CON103
is
not
fitted
to
production
items
Micro
I/O
Pin
descriptions
Pin
name
Description
SPDIF
INT
Interrupt
flag
from
the
SPDIF
receiver
Source
To
source
select
TACT
switch
Mute
RLY
Control
of
mute
relay
via
TR100
DAC
MUTE
DAC
MUTE
signal
to
Pin
25
of
Wolfson
DAC
at
location
IC301
ENABLE
KLEER
To
MUX
at
location
IC205A
ENABLE
SPDIF
To
MUX
at
location
IC202A
SERIAL
UC
to
KLEER
Serial
control
to
KLEER
wireless
option
SERIAL
KLEER
to
UC
Serial
data
from
KLEER
to
UC
SCL
To
EEprom
at
location
IC108
/
DAC
at
location
IC301
/
USB
receiver
at
IC103
SDA
To
EEprom
at
location
IC108
/
DAC
at
location
IC301
/
USB
receiver
at
IC103
Enable
LEDS
LEDs
on
control
LED
0
Binary
select
for
LED
control
via
3
–
8
line
decoder
at
location
IC102
LED
1
Binary
select
for
LED
control
via
3
–
8
line
decoder
at
location
IC102
LED
3
Binary
select
for
LED
control
via
3
–
8
line
decoder
at
location
IC102
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