PCIMX536AVV8B datasheet(140/180 Pages) FREESCALE

140 / 180 page

i.MX53xA Automotive and Infotainment Applications Processors, Rev. 1

140

Freescale Semiconductor

Electrical Characteristics

4.7.18.3

UART IrDA Mode Timing

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

4.7.18.3.3

UART IrDA Mode Transmitter

Figure 91 depicts the UART IrDA mode transmit timing, with 8 data bit/1 stop bit format. Table 89 lists

the transmit timing characteristics.

Figure 91. UART IrDA Mode Transmit Timing Diagram

4.7.18.3.4

UART IrDA Mode Receiver

Figure 92 depicts the UART IrDA mode receive timing, with 8 data bit/1 stop bit format. Table 90 lists the

receive timing characteristics.

Figure 92. UART IrDA Mode Receive Timing Diagram

Table 89. IrDA Mode Transmit Timing Parameters

Parameter

Symbol

Min

Max

Units

UA3

Transmit Bit Time in IrDA mode

tTIRbit

1/Fbaud_rate

1 –

Tref_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

—

UA4

Transmit IR Pulse Duration

tTIRpulse

(3/16)*(1/Fbaud_rate)

– Tref_clk

(3/16)*(1/Fbaud_rate)+

Tref_clk

—

Table 90. IrDA Mode Receive Timing Parameters

Parameter

Symbol

Min

Max

Units

UA5

Receive Bit Time1 in IrDA mode

tRIRbit

1/Fbaud_rate

2 –

1/(16*Fbaud_rate)

1/Fbaud_rate +

1/(16*Fbaud_rate)

—

UA6

Receive IR Pulse Duration

tRIRpulse

1.41 us

(5/16)*(1/Fbaud_rate)—

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

TXD

(output)

Bit 3

Start

Bit

STOP

BIT

Possible

Parity

Bit

UA3

UA4

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

RXD

(input)

Bit 3

Start

Bit

STOP

BIT

Possible

Parity

Bit

UA5

UA6

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