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UART
Intel® Quark™ SE Microcontroller C1000
June 2017
Platform Design Guide
Document Number: 334715-004EN
31
6.0
UART
UART is one of the hardware blocks in the Serial I/O (SIO).
The main features of the UART interface as follows:
Two 16550 compliant UART interfaces
Supports baud rates from 300 to 2M with less than 2% frequency error
Supports hardware and software flow control
FIFO mode support (16B TX and RX FIFOs)
Supports HW DMA with configurable FIFO thresholds
Supports 8-bit operation mode
Supports RS485 and RS232
Supports DTR/DCD/DSR/RI Modem Control Pins through GPIO pins controlled
by software
6.1
Signal Descriptions
Table 12. UART Signals
Signal Name
Direction/
Type
Description
UART_x_TXD
Output
UART A single-ended Transmit data (RS232 or
RS485). In RS485 mode, the differential driver is
outside the SoC.
UART_x_RXD
Input
UART A single-ended Receive data (RS232 or RS485).
In RS485 mode, the differential receiver is outside
the SoC.
UART_x_RTS
Output
UART A Request to send (RS232)
UART_x_CTS
Input
UART A Clear to send (RS232)
Figure 14. UART Point-to-Point Topology
TL0
TL1
UART
Device
UART_TXD/RXD/CTS/RTS
ATP SoC