IMX7DCEC datasheet(114/161 Pages) NXP

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Electrical characteristics

i.MX 7Dual Family of Applications Processors Datasheet, Rev. 7, 09/2023

NXP Semiconductors

114

4.10.14 UART I/O configuration and timing parameters

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

The i.MX 7Dual UART interfaces can serve both as DTE or DCE device. This can be configured by the

DCEDTE control bit (default 0—DCE mode). Table 88 shows the UART I/O configuration based on the

enabled mode.

4.10.14.2 UART RS-232 Serial mode timing

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

SJ9

JTAG_TMS, JTAG_TDI data hold time

—

SJ10

JTAG_TCK low to JTAG_TDO data valid

—

SJ11

JTAG_TCK low to JTAG_TDO high impedance

—

SJ12

JTAG_TRST_B assert time

100

—

SJ13

JTAG_TRST_B set-up time to JTAG_TCK low

—

1 TDC = target frequency of SJC

2 VM = mid-point voltage

Table 88. 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 87. JTAG timing(continued)

Parameter1,2

All Frequencies

Unit

Min

Max

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