IMX28CEC datasheet(59/70 Pages) FREESCALE

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i.MX28 Applications Processors Data Sheet for Consumer Products, Rev. 1

Freescale Semiconductor

3.5.15

UART (UARTAPP and DebugUART) AC Timing

This section describes the UART module AC timing which is applicable to both UARTAPP and

DebugUART.

3.5.15.1

UART Transmit Timing

Figure 39 shows the UART transmit timing, showing only eight data bits and one stop bit. Table 63

describes the timing parameter (UA1) shown in the figure.

Figure 42. UART Transmit Timing Diagram

3.5.15.2

UART Receive Timing

Figure 43 shows the UART receive timing, showing only eight data bits and one stop bit. Table 64

describes the timing parameter (UA2) shown in the figure.

–

Figure 43. UART Receive Timing Diagram

Table 63. UART Transmit Timing Parameters

Parameter

Symbol

Min.

Max.

Units

UA1

Transmit Bit Time

tTbit

1/Fbaud_rate

1 – T

ref_clk

1 F

baud_rate: Baud rate frequency. The maximum baud rate the UARTAPP can support is 3.25 Mbps. The maximum baud rate of

DebugUART is 115.2 kbps.

2 T

ref_clk: The period of UART reference clock ref_clk (which is APBX clock = 24 MHz).

1/Fbaud_rate + Tref_clk

—

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

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

RXD

(input)

Bit 3

Start

Bit

STOP

BIT

Start

Bit

Possible

Parity

Bit

Par Bit

UA2

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