SE-U55
Microprocessor terminal descriptions
No.
Pin
Name
I/O
Function
1
3.3V
+3.3V
2
RESET
I
Reset
input
(RESET:"L")
3
GND
I
GND
4
GND
I/O
GND
5
4MHz
I
External
4MHz
clock
input
6
4MHz
I
External
4MHz
clock
input
7
3.3V
+3.3V
8
GND
GND
9
X1A
Open
10
CLK
O
CLK
signal
output
of
SRC(TDA1373H)
11
SRC_LD
O
LD
signal
output
of
SRC(TDA1371H)
12
SRC_RESET
O
Reset
output
of
SRC(TDA1373H)
13
WAV/DIR
O
CODEC
output
(WAVE
or
MONITOR)
select
signal
output
(WAVE
:
"H")
14
DIT
C15
O
To
DIT
C15pin
15
DIT
C2
O
To
DIT
C2pin
16
(NO
USE)
O
Open
17
DIT
C3
O
To
DIT
3pin
18
(NO
USE)
I
GND
19
GND
GND
20
SRC_DA
I/O
Serial
data
of
SRC81373H)
input/output
21
CODEC
RST
I/O
To
VREF
of
USB
CODEC(UDA1325)
22
DIG_ANA
O
EEPROM
for
USB
CODEC
select
signal
output
23
I2C
SDA
A
I/O
SDA
port
for
EEPROM
writing.
24
I2C
SCL
A
I/O
SCL
port
for
EEPROM
writing.
25
I2C
SDA
D
I/O
SDA
port
for
EEPROM
writing
for
DIGITAL
setup.
Usually,
it
considers
as
an
input
and
becomes
SDA
input
and
output
at
the
time
of
writing.
26
I2C
SCL
D
I/O
SCL
port
for
EEPROM
writing
for
DIGITAL
setup.
Usually,
it
considers
as
an
input
and
becomes
SCL
output
at
the
time
of
27
(NO
USE)
I
GND
28
EPROM
WR
I/O
EEPROM
write-in
control
port.
Usually,
it
is
an
input
port,
and
immediately
after
reset,
when
this
is
"L",
"L"
is
outputted
and
EEPROM
is
written
in.
29
(NO
USE)
I
GND
30
MAC/WIN
I
The
setting
switch
(H:WIN,
L:MAC)
of
WIN/MAC.
31
ONK/KORG
I
Copyright
output
protection.
(H:normal
mode)
32
PROTECT
I
Existence
of
copyright
protection
information.
(H:normal
mode)
33
PON_RST
O
Power-on
reset.
34
CODEC
D+
I/O
D+
of
USB
CODEC
(UDA1325)
is
controlled.
Usually,
it
is
"H"
and
D+
is
grounded
through
a
diode
by
"L."
35
(NO
USE)
I
GND
36
POWER
MODE
I
A
setup
of
POWER
MODE
of
USB.
L:
BUS
POWER
H:SELF
POWER.
37
(NO
USE)
I
GND
38
(NO
USE)
I
GND
39
(NO
USE)
I
GND
40
OPT/COAX
I
The
change
switch
of
OPTICAL
and
COAXICAL.
H:
COAXICAL
and
L:OPTICAL.
41
UPLED
O
Light
Emitting
Diode
display
of
UP
(the
light
is
switched
on
by
42
MCU
MUTE
O
MCU_MUTE
(it
is
MYUTO
operation
at
"L").
43
GND
GND
44
3.3V
3.3V
45
MODE
I
The
change
switch
of
MONITOR/INTERNAL/LINE/Media
Interface
Connector.
46
(NO
USE)
O
GND
47
INH
O
Prohibition
of
an
analog
input
(it
forbids
by
"H").
48
MIC/LINE
O
An
input
change
of
Media
Interface
Connector/LINE.
H:
Media
Interface
Connector,
L:LINE.
