User Guide

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ME3630
Hardware Development Guide
function mode while the Debug UART Port is used for software debugging . The following show the different features.
Main UART interface support 1200 2400 4800 9600 19200 38400 57600 115200 230400 460800 921600 1000000 1500000
2000000 2500000 3000000 3500000bps baud rate, the default is 115200bps, This interface can be used for data transmission; AT
communication or firmware upgrade (upgrade is not supported currently).
Debug UART interface supports 115200bps baud rate. It can be used for software debug and firmware upgrade. The module is
designed as the DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal Equipment) connection.
The following tables show the pin definition of these two UART interfaces.
Table 2–12 Pin Definition of the Main UART Interface
Pin Name
Pin NO.
I/O
Description
Comment
UART_RI
60
DO
Ring indicator
1.8V power domain
UART_DCD
59
DO
Data carrier detection
1.8V power domain
UART_CTS
56
DI
Clear to send
1.8V power domain
UART_RTS
55
DO
Request to send
1.8V power domain
UART_DTR
58
DI
Data terminal ready
1.8V power domain.
UART_DSR
57
DO
Data set ready
1.8V power domain.
UART_TXD
53
DO
Transmit data
1.8V power domain
UART_RXD
54
DI
Receive data
1.8V power domain
Table 2–13 Pin Definition of the Debug UART Interface
Pin Name
Pin NO.
I/O
Description
Comment
UART_DEBUG_TXD
68
DO
Transmit data
1.8V power domain
UART_DEBUG_RXD
67
DI
Receive data
1.8V power domain
2.10.1. UART CONNECTION
Three normal connections for UART are shown in the figures below:
1. 8-wires UART connection mode, mainly used for MODEM mode(PPP dialing for example)
TXD1
RXD1
RTS1
CTS1
DTR1
DCD1
RING1
TXD
RXD
RTS
CTS
DTR
DCD
RING
Serial Port
Serial Port
(DCE)
(DTE)
GND GND
Figure 2–17 Schematic of 8-wire UART Connection