IMX6SDLCEC datasheet(130/169 Pages) NXP

130 / 169 page

i.MX 6Solo/6DualLite Applications Processors for Consumer Products, Rev. 9, 11/2018

130

NXP Semiconductors

Electrical Characteristics

4.11.20 UART I/O Configuration and Timing Parameters

4.11.20.1 UART RS-232 I/O Configuration in Different Modes

The i.MX 6Solo/6DualLite UART interfaces can serve both as DTE or DCE device. This can be

configured by the DCEDTE control bit (default 0—DCE mode). Table 86 shows the UART I/O

configuration based on the enabled mode.

4.11.20.2 UART RS-232 Serial Mode Timing

The following sections describe the electrical information of the UART module in the RS-232 mode.

4.11.20.2.1 UART Transmitter

Figure 95 depicts the transmit timing of UART in the RS-232 serial mode, with 8 data bit/1 stop bit

format. Table 87 lists the UART RS-232 serial mode transmit timing characteristics.

Figure 95. UART RS-232 Serial Mode Transmit Timing Diagram

Table 86. UART I/O Configuration vs. Mode

Port

DTE Mode

DCE Mode

Direction

Description

Direction

Description

UARTx_RTS_B

Output

RTS from DTE to DCE

Input

RTS from DTE to DCE

UARTx_CTS_B

Input

CTS from DCE to DTE

Output

CTS from DCE to DTE

UARTx_DTR_B

Output

DTR from DTE to DCE

Input

DTR from DTE to DCE

UARTx_DSR_B

Input

DSR from DCE to DTE

Output

DSR from DCE to DTE

UARTx_DCD_ B

Input

DCD from DCE to DTE

Output

DCD from DCE to DTE

UARTx_RI_B

Input

RING from DCE to DTE

Output

RING 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 87. 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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