Uart Interface; Overview - Huawei MU709 Series Hardware Manual

HUAWEI MU709 Series HSPA+ LGA Module
Hardware Guide
Figure 3-11 Driving circuit

3.5 UART Interface

3.5.1 Overview

The MU709 module provides the UART0 (8-wire UART) interface for one
asynchronous communication channel. As the UART0 interface supports signal
control through standard modem handshake, AT commands are entered and serial
communication is performed through the UART0 interface. The UART have the
following features:
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The 2-wire UART1 is for debugging only. Customers should layout two test points,
which are required for system troubleshooting and analysis.
Table 3-8 lists the UART interface signals.
Table 3-8 UART interface signals
Pin Pin Name
No.
1 UART1_TX
4 UART1_RX
Issue 09 (2017-12-15)
Full-duplex
7-bit or 8-bit data
1-bit or 2-bit stop bit
Odd parity check, even parity check, or non-check
Baud rate clock generated by the system clock
Direct memory access (DMA) transmission
Supported baud rate: 9600 bit/s, 19200 bit/s, 38400 bit/s, 57600 bit/s, 115200
bit/s (default), 230400 bit/s, 460800 bit/s and 921600 bit/s
Pad Description
Type
O UART1 transmit output for
debugging.
I UART1 receive data input for
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Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
F F
Parameter Min.
(V)
V 1.35
OH
V 0
OL
V 1.26
IH
Typ. Max.
(V) (V)
1.8 2.1
- 0.45
1.8 2.1
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