Technical data

4.11.2 UART3 (DTM3, DFM3)
The reason UART2 is skipped is that GR64 does not support more than two UART
interfaces. The removed interface was represented by UART2 for the GR47/48, so for
legacy reasons the second UART in GR64 is called UART3.
Pin Name Direction Function
43 DTM3 Input Data To Wireless CPU® from host (UART3)
44 DFM3 Output Data From Wireless CPU® to host (UART3)
UART 3 consists of a full duplex serial communication port with transmission and
reception lines.
Timing and electrical signals characteristics are the same as for UART1, DTM1 and
DFM1, including the baud rate range and the capability to auto-baud.
This interface is used by Wavecom for degug logging. It is strongly
recommended that this interface is made available in case the
application needs to be debugged.
TIP
4.11.2.1 Transmitted Data (DTM3)
DTM3 is used by the application to send data to the Wireless CPU® via UART3. It has
the same electrical characteristics the equivalent signal in UART1.
4.11.2.2 Received Data (DFM3)
DFM3 is used to send data to the application via UART3. It has the same electrical
characteristics as the equivalent signal in UART1.
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GR64 Integrators’ Manual
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