User Guide

ME310G1 Hardware User Guide
1VV0301588 Rev. 4 Page 41 of 77 2020-01-21
5.6.3.1. Asynchronous Serial Port (USIF0)
The serial port 0 on the ME310G1 is a +1.8V UART with 5 RS232 signals. It differs from the
PC-RS232 in the signal polarity (RS232 is reversed) and levels.
The following table is listing the available signals:
RS232
Pin
Signal
Pad
Name
Usage
2
C104/RXD0
AA15
Transmit line
Output transmit line of
ME310G1 UART
3
C103/TXD0
Y16
Receive line
Input receive of the
ME310G1 UART
Pull-up default during ON
state
4
DTR
(*)
Data
Terminal
Ready
Input to the ME310G1 that
controls the DTE READY
condition
5
GND
A3, A7, A9, A13,
A17, B4, B6, B10,
B12, B14, B16,
C19, D18, F8,
F12, F18, G19,
H6, H14, J19,
K18, M18, N19,
P6, P14, T8, T12,
U1, V2, W19, Y2,
Y4
Ground
Ground
8
C106/CTS0
AA17
Clear to
Send
Output from the
ME310G1 that controls
the Hardware flow control
7
C105/RTS0
Y18
Request to
Send
Input to the ME310G1 that
controls the Hardware flow
control
Pull-up default during ON
state
9
RING
(*)
Ring
Indicator
Output from the ME310G1
that indicates the incoming
call condition
* Alternate function with GPIO, refer to par. 5.7