IMX53CEC datasheet(133/204 Pages) FREESCALE

133 / 204 page

Electrical Characteristics

i.MX53xD Applications Processors for Consumer Products, Rev. 2

Freescale Semiconductor

133

NOTE

•

All the timings for the SSI are given for a non-inverted serial clock

polarity (TSCKP/RSCKP = 0) and a non-inverted frame sync

(TFSI/RFSI = 0). If the polarity of the clock and/or the frame sync have

been inverted, all the timing remains valid by inverting the clock signal

STCK/SRCK and/or the frame sync STFS/SRFS shown in the tables

and in the figures.

•

All timings are on Audiomux Pads when SSI is being used for data

transfer.

•

“Tx” and “Rx” refer to the Transmit and Receive sections of the SSI.

•

The terms WL and BL refer to Word Length (WL) and Bit Length (BL).

•

For internal Frame Sync operation using external clock, the FS timing is

same as that of Tx Data (for example, during AC97 mode of operation).

4.7.17

UART I/O Configuration and Timing Parameters

4.7.17.1

UART RS-232 I/O Configuration in Different Modes

The i.MX53xD UART interfaces can serve both as DTE or DCE device. This can be configured by the

DCEDTE control bit (default 0 – DCE mode). Table 87 shows the UART I/O configuration based on the

enabled mode.

4.7.17.2

UART RS-232 Serial Mode Timing

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

4.7.17.2.1

UART Transmitter

Figure 85 depicts the transmit timing of UART in the RS-232 serial mode, with 8 data bit/1 stop bit format.

Table 88 lists the UART RS-232 serial mode transmit timing characteristics.

Table 87. UART I/O Configuration vs. Mode

Port

DTE Mode

DCE Mode

Direction

Description

Direction

Description

RTS

Output

RTS from DTE to DCE

Input

RTS from DTE to DCE

CTS

Input

CTS from DCE to DTE

Output

CTS from DCE to DTE

DTR

Output

DTR from DTE to DCE

Input

DTR from DTE to DCE

DSR

Input

DSR from DCE to DTE

Output

DSR from DCE to DTE

DCD

Input

DCD from DCE to DTE

Output

DCD from DCE to DTE

Input

RING from DCE to DTE

Output

RING from DCE to DTE

TXD_MUX

Input

Serial data from DCE to DTE

Output

Serial data from DCE to DTE

RXD_MUX

Output

Serial data from DTE to DCE

Input

Serial data from DTE to DCE

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