CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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Figure 3-16 Level conversion chip circuit
3.6.2 Debug UART port
The CLM920_RC3 module provides a 2-wire DEBUG serial port as a debugging module.
The debugging serial port supports a baud rate of 115200bps. It is used for Linux control and
log printing. Test points can be reserved.
Table 3-14 Debug serial port pin definition
Pin
Signal name
I/O
Description
11
DBG_RXD
DI
Module receives data
12
DBG_TXD
DO
Module sends data
3.6.3 RI Signal interface
The RI pin can be used as an interrupt to wake up the host.
The idle state of the RI pin is low. When a short message or voice call is received, the RI will
output six rectangular waves with a period of 500ms (high level for 250ms, low level for
250ms) to wake up the host.
