IMX35 datasheet(121/148 Pages) FREESCALE

121 / 148 page

i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6

Freescale Semiconductor

121

4.9.23

UART Electrical

This section describes the electrical information of the UART module.

4.9.23.1

UART RS-232 Serial Mode Timing

The following subsections give the UART transmit and receive timings in RS-232 serial mode.

4.9.23.1.11

UART Transmitter

Figure 97 depicts the transmit timing of UART in RS-232 serial mode, with 8 data bit/1 stop bit format.

Table 78 lists the UART RS-232 serial mode transmit timing characteristics.

Figure 97. UART RS-232 Serial Mode Transmit Timing Diagram

SS25

(Tx/Rx) CK clock low period

36.0

—

SS26

(Tx/Rx) CK clock fall time

—

6.0

SS28

(Rx) CK high to FS (bl) high

–10.0

15.0

SS30

(Rx) CK high to FS (bl) low

10.0

—

SS32

(Rx) CK high to FS (wl) high

–10.0

15.0

SS34

(Rx) CK high to FS (wl) low

10.0

—

SS35

(Tx/Rx) External FS rise time

—

6.0

SS36

(Tx/Rx) External FS fall time

—

6.0

SS40

SRXD setup time before (Rx) CK low

10.0

—

SS41

SRXD hold time after (Rx) CK low

2.0

—

Table 77. SSI Receiver with External Clock Timing Parameters (continued)

Parameter

Min.

Max.

Unit

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

TXD

(output)

Bit 3

Start

Bit

STOP

BIT

Start

Bit

Possible

Parity

Bit

Par Bit

UA1

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