MCIMX503CVM8B datasheet(97/134 Pages) FREESCALE

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Electrical Characteristics

i.MX50 Applications Processors for Consumer Products, Rev. 2

Freescale Semiconductor

4.9.10.2.1

UART Transmitter

Figure 55 depicts the transmit timing of UART in the RS-232 serial mode with 8 data bit/1 stop bit

format. Table 70 lists the UART RS-232 serial mode transmit timing characteristics.

Figure 55. UART RS-232 Serial Mode Transmit Timing Diagram

4.9.10.2.2

UART Receiver

Figure 56 depicts the RS-232 serial mode receive timing with 8 data bit/1 stop bit format. Table 71 lists

serial mode receive timing characteristics.

Figure 56. UART RS-232 Serial Mode Receive Timing Diagram

4.9.10.3

UART IrDA Mode Timing

The following sections give the UART transmit and receive timings in IrDA mode.

Table 70. RS-232 Serial Mode 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 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

—

Table 71. RS-232 Serial Mode Receive Timing Parameters

Parameter

Symbol

Min

Max

Units

UA2

Receive Bit Time1

1 The UART receiver can tolerate 1/(16*F

baud_rate) tolerance in each bit. But accumulation tolerance in one frame must not

exceed 3/(16*Fbaud_rate).

tRbit

1/Fbaud_rate

2 – 1/(16*F

baud_rate)

2 F

baud_rate: Baud rate frequency. The maximum baud rate the UART can support is (ipg_perclk frequency)/16.

1/Fbaud_rate + 1/(16*Fbaud_rate)—

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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