SN32F760 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 153
Version 2.0
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UNIVERSAL SYNCHRONOUS AND
ASYNCHRONOUS RECEIVER AND
TRANSMITTER (USART)
14.1 OVERVIEW
The USART offers a flexible means of full-duplex data exchange with external equipment requiring an industry
standard NRZ asynchronous serial data format. The serial interface is applied to low speed data transfer and
communicate with low speed peripheral devices.
The USART offers a very wide range of baud rates using a fractional baud rate generator. It supports both
synchronous one-way communication and single wire communication. It also supports the LIN (local interconnection
network), Smart card Protocol, and modem operations (CTS/RTS).
14.2 FEATURES
Full-duplex, 2-wire asynchronous data transfer.
Single-wire half-duplex communication
Transmitter clock output for synchronous transmission
16-byte receive and transmit FIFOs
Register locations conform to 16550 industry standard.
Receiver FIFO trigger points at 1, 4, 8, and 14 bytes.
Built-in baud rate generator.
Software or hardware flow control.
EIA-485 9-bit mode support with output enable.
Modem control signals (CTS/RTS).
ISO 7816-3 compliant Smart card interface.
14.3 PIN DESCRIPTION
Pin Name
Type
Description
GPIO Configuration
UTXDn
O
Serial Transmit data.
URXDn
I
Serial Receive data.
Depends on GPIOn_CFG
USCKn
O
Serial clock of Synchronous mode (Master)
UCTSn
I
Clear to Send.
When low, this indicates that the MODEM or data set is ready
to exchange data. The CTS signal is a MODEM status input
whose conditions can be tested by reading bit 4 (CTS) of
USARTn_MS register.
Depends on GPIOn_CFG
URTSn
O
Request to Send. RS-485 direction control pin.
When low, this informs the MODEM or data set that the
UART is ready to exchange data. The RTS output signal can
be set to an active low by programming bit 1 (RTS) of
USARTn_MC register. Loop mode operation holds this signal
in its inactive state.
Содержание SN32F755
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