TechNexion PICO-IMX6, Hardware Manual

Page: 40 / 64

PICO-IMX6 REV. A1. HARDWARE MANUAL
– VER 1.01 – JAN 28 2016
Page 40 of 64
3.13. Universal Asynchronous Receiver/Transmitter (UART) Interface
The PICO-IMX6 makes 2 UART ports available and utilizes an additional UART on the module to connect
to the WiFi/Bluetooth module.
The i.MX6 processor integrated UARTs support the following features:

High-speed TIA/EIA-232-F compatible, up to 5.0 Mbit/s.

Serial IR interface low-speed, IrDA-compatible (up to 115.2 Kbit/s).

9-bit or Multidrop mode (RS-485) support (automatic slave address detection).

7 or 8 data bits for RS-232 characters or 9 bit RS-485 format, 1 or 2 stop bits.

Programmable parity (even, odd, and no parity).

Hardware flow control support for request to send (RTS) and clear to send (CTS) signals

RXD input and TXD output can be inverted respectively in RS-232/RS-485 mode

RS-485 driver direction control via CTS signal

Auto baud rate detection (up to 115.2 Kbit/s)

Two independent, 32-entry FIFOs for transmit and receive
For additional details, please refer to the “Universal Asynchronous Receiver/Transmitter (UART)” chapter
of the “i.MX6 Reference Manual”.
Table 19 - UART Signal Description
PIN
CPU
BALL
CPU PAD NAME Signal V I/O Description
E1_22 M3 CSI0_DAT11 UART1_RX 1V8 I
Universal Asynchronous
Receive Transmit receive
data signal
E1_27 M1 CSI0_DAT10 UART1_TX 1V8 O
Universal Asynchronous
Receive Transmit transmit
data signal
E1_46 F22 EIM_D24 UART3_TXD 1V8 O
Universal Asynchronous
Receive Transmit transmit
data signal
E1_61 G22 EIM_D25 UART3_RXD 1V8 I
Universal Asynchronous
Receive Transmit receive
data signal
E1_63 H21 EIM_D31 UART3_RTS 1V8 O
Universal Asynchronous
Receive Transmit request to
send signal
E1_65 D25 EIM_D23 UART3_CTS 1V8 O
Universal Asynchronous
Receive Transmit clear to
send signal
NOTE: it is recommended to use the UART1 interface as system debug where possible and use the
UART3 signals in applications where one serial port is required.
NOTE: UART2 is not listed in this section. This interface is connected from the i.MX6 processor towards
the WiFi/Bluetooth interface present on PICO-IMX6 and can be found in the WiFi/Bluetooth section of this
manual.