User Manual

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CL5ADAH2Z
Confidential
2020.11.05 rev.1.1
3.4. UART Interface
The module includes a 4-wire UART interface (UART0 - 2).
The UART is an asynchronous serial interface. The interface is a fully compliant and standard RS-
232.
Offers similar functionality to industry-standard 16C550 UART devices.
UART0 is used for AT command or PPP.
* AT command response timeout: max 120s
UART1 is used for debug.
UART2 is used for CLI and firmware version up.
Support baud rates of up to 3Mbps (*). The baud rate can only be changed via AT command. (Refer
to Software Application Guide)
The maximum baud rate error is 1.56%.
* Flow control is recommended when the baud rate setting is over 1Mbps.
Default setting is following:
Baud rete: 115200, Data: 8bit, Parity: none, Stop: 1bit, Flow control: none (See Data Format)
Table9 List of UART0 pins
No.
Pin Name
I/O Description
C8 UART0_RX I
UART0 receiving data. Active low
0V=active (Data bit=1)
1.8V=not active (Data bit=0)
D8 UART0_TX O
UART0 transmitting data. Active low
0V=active (Data bit=1)
1.8V=not active (Data bit=0)
D9 UART0_CTS I
UART0 clear to send.
0V=not active (Data bit=0)
1.8V=active (Data bit=1)
E8 UART0_RTS O
UART0 ready to send.
0V=not active (Data bit=0)
1.8V=active (Data bit=1)