Specifications

M80 Hardware Design
M80_HD_V1.0 - 25 -
NETLIGH
T
4
O
Network status
indication
VOHmin=
0.85*VDD_EXT
VOLmax=
0.15*VDD_EXT
If unused, keep these
pins open.
Main UART port
PIN NAME
PIN
NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
DTR
47
I
Data terminal ready
VILmin=-0.3V
VILmax=
0.25*VDD_EXT
VIHmin=
0.75*VDD_EXT
VIHmax=
VDD_EXT+0.3
VOHmin=
0.85*VDD_EXT
VOLmax=
0.15*VDD_EXT
If only use TXD,
RXD and GND to
communicate,
recommend keeping
other pins open.
RXD
50
I
Receiving data
TXD
49
O
Transmitting data
RTS
51
I
Request to send
CTS
48
O
Clear to send
RI
46
O
Ring indicator
DCD
45
O
Data carrier detection
Debug UART port
PIN NAME
PIN
NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
DBG_TXD
42
O
UART interface for
debugging only.
VILmin=-0.3V
VILmax=
0.25*VDD_EXT
VIHmin=
0.75*VDD_EXT
VIHmax=
VDD_EXT+0.3
VOHmin=
0.85*VDD_EXT
VOLmax=
0.15*VDD_EXT
If unused, keep these
pins open.
DBG_RXD
43
I
Auxiliary UART port
PIN NAME
PIN
NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
TXD_AUX
40
O
Transmit data
VILmin=-0.3V
VILmax=0.25*VDD
_EXT
VIHmin=0.75*VDD
_EXT
VIHmax=VDD_EXT
+0.3
VOHmin=0.85*VDD
_EXT
If unused, keep these
pins open.
RXD_AUX
41
I
Receive data
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