TOBY-L4 series - System Integration Manual
UBX-16024839 - R04
System description
Page 43 of 143
1.9.2.2
UART1 interface
The UART1 Universal Asynchronous Receiver/Transmitter serial interface, with CMOS compatible signal levels
(0 V for ON / active state and 1.8 V for OFF / idle state), can operate as a
serial interface for communication with external devices by means of the uCPU API, with the following pins:
o
RXD1
module output and
TXD1
module input data lines
o
CTS1
module output and
RTS1
module input hardware flow control lines
The UART1 interface can operate at 9.6 kbit/s, 19.2 kbit/s, 38.4 kbit/s, 57.6 kbit/s, 115.2 kbit/s, 230.4 kbit/s,
460.8 kbit/s, 921.6 kbit/s, 3 Mbit/s, 3.25 Mbit/s and 6.5 Mbit/s baud rates, with 8N1 frame format (illustrated in
Figure 16), and with hardware flow control output (
CTS1
line) driven to the OFF state when the module is not
prepared to accept data by the UART1 interface.
The UART1 interface can be alternatively, in mutually exclusive way, configured as SPI1 interface by means of the
uCPU API, for communication with external devices with the following pins:
o
RXD1
pin, alternatively configured as SPI1 Master Output Slave Input (module output)
o
TXD1
pin, alternatively configured as SPI1 Master Input Slave Output (module input)
o
CTS1
pin, alternatively configured as SPI1 Chip Select (module output)
o
RTS1
pin, alternatively configured as SPI1 Clock (module output)
1.9.2.3
UART2 interface
The UART2 Universal Asynchronous Receiver/Transmitter serial interface, with CMOS compatible signal levels
(0 V for ON / active state and 1.8 V for OFF / idle state), can operate as a
serial interface for communication with external devices by means of the uCPU API, with the following pins:
o
RXD2
module output and
TXD2
module input data lines
The UART2 interface can operate at 9.6 kbit/s, 19.2 kbit/s, 38.4 kbit/s, 57.6 kbit/s, 115.2 kbit/s, 230.4 kbit/s,
460.8 kbit/s, 921.6 kbit/s, 3 Mbit/s, 3.25 Mbit/s and 6.5 Mbit/s baud rates, with 8N1 frame format (illustrated in
Figure 16).
1.9.2.4
UART3 interface
The UART3 Universal Asynchronous Receiver/Transmitter serial interface, with CMOS compatible signal levels
(0 V for ON / active state and 1.8 V for OFF / idle state), can operate as
Linux console for uCPU API development and debug, with the following pins:
o
RXD3
module output and
TXD3
module input data lines
The UART3 interface can operate at 9.6 kbit/s, 19.2 kbit/s, 38.4 kbit/s, 57.6 kbit/s, 115.2 kbit/s, 230.4 kbit/s,
460.8 kbit/s, 921.6 kbit/s, 3 Mbit/s, 3.25 Mbit/s and 6.5 Mbit/s baud rates, with 8N1 frame format (illustrated in
Figure 16).
