IMX8MMIEC datasheet(65/92 Pages) NXP

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Electrical characteristics

i.MX 8M Mini Applications Processor Datasheet for Industrial Products, Rev. 1, 07/2020

NXP Semiconductors

3.9.13 UART I/O configuration and timing parameters

3.9.13.1 UART RS-232 I/O configuration in different modes

The i.MX 8M Mini UART interfaces can serve both as DTE or DCE device. This can be configured by

the DCEDTE control bit (default 0—DCE mode). Table 58 shows the UART I/O configuration based on

the enabled mode.

3.9.13.2 UART RS-232 Serial mode timing

This section describes the electrical information of the UART module in the RS-232 mode.

3.9.13.2.1 UART transmitter

Figure 45 depicts the transmit timing of UART in the RS-232 Serial mode, with 8 data bit/1 stop bit

format. Table 59 lists the UART RS-232 Serial mode transmit timing characteristics.

Figure 45. UART RS-232 Serial mode transmit timing diagram

Table 58. UART I/O configuration vs. mode

Port

DTE Mode

DCE Mode

Direction

Description

Direction

Description

UARTx_RTS_B

Output

UARTx_RTS_B from DTE to DCE

Input

UARTx_RTS_B from DTE to DCE

UARTx_CTS_B

Input

UARTx_CTS_B from DCE to DTE

Output

UARTx_CTS_B from DCE to DTE

UARTx_TX_DATA

Input

Serial data from DCE to DTE

Output

Serial data from DCE to DTE

UARTx_RX_DATA

Output

Serial data from DTE to DCE

Input

Serial data from DTE to DCE

Table 59. RS-232 Serial mode transmit timing parameters

Parameter

Symbol

Min

Max

Unit

UA1

Transmit Bit Time

tTbit

1/Fbaud_rate

1 - T

ref_clk

1 F

baud_rate: Baud rate frequency. The maximum baud rate the UART can support is (ipg_perclk frequency)/16.

2 T

ref_clk: The period of UART reference clock ref_clk (ipg_perclk after RFDIV divider).

1/Fbaud_rate + Tref_clk

—

Start

Bit

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

UARTx_TX_DATA

(output)

Bit 3

STOP

BIT

Start

Bit

Possible

Parity

Bit

Par Bit

UA1

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