Embedian, Inc.
71
SMARC-iMX8MM Computer on Module User’s Manual
v. 1.2
2.1.14.1.
UART
Signals
Module
pins
for
up
to
four
asynchronous
serial
ports
are
defined.
The
ports
are
designated
SER0
–
SER3
.
Ports
SER0
and
SER2
are
4
wire
ports
(2
data
lines
and
2
handshake
lines).
Ports
SER1
and
SER3
are
2
wire
ports
(data
only).
Edge
Golden
Finder
Signal
Name
Direction
Type
Tolerance
Description
SER[0:3]_TX
Output
CMOS
1.8V
Asynchronous
serial
port
data
out
SER[0:3]_RX
Input
CMOS
1.8V
Asynchronous
serial
port
data
in
SER[0]_RTS#
Output
CMOS
1.8V
Request
to
Send
handshake
line
for
SER0
SER[0]_CTS#
Input
CMOS
1.8V
Clear
to
Send
handshake
line
for
SER0
SER[2]_RTS#
Output
CMOS
1.8V
Request
to
Send
handshake
line
for
SER2
SER[2]_CTS#
Input
CMOS
1.8V
Clear
to
Send
handshake
line
for
SER2
