ML865G1 HW Design Guide
1VV0301632 Rev. 4 Page 48 of 86 2020-09-23
5.8.3. SPI Connections
5.8.4. Serial Ports
The ML865G1 module is provided with by 2 Asynchronous serial ports:
• MODEM SERIAL PORT 1 (Main)
• MODEM SERIAL PORT 2 (Auxiliary)
Several configurations can be designed for the serial port on the OEM hardware, but the
most common are:
• RS232 PC com port
• microcontroller UART @ 1.8V (Universal Asynchronous Receive Transmit)
• microcontroller UART @ 5V or other voltages different from 1.8V
Depending from the type of serial port on the OEM hardware a level translator circuit may
be needed to make the system work. On the ML865G1 the ports are CMOS 1.8.
5.8.4.1. Modem serial port 1 (USIF0)
The serial port 1 on the ML865G1 is a +1.8V UART with all the 7 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:
SPI_MOSI
SPI_CLK
ML865G1
Application
Processor
SPI_CS
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