IMX53IEC datasheet(131/173 Pages) FREESCALE

131 / 173 page

Electrical Characteristics

i.MX53 Applications Processors for Industrial Products, Rev. 6

Freescale Semiconductor

131

Figure 87. UART IrDA Mode Transmit Timing Diagram

4.7.17.3.4

UART IrDA Mode Receiver

Figure 88 depicts the UART IrDA mode receive timing, with 8 data bit/1 stop bit format. Table 90 lists the

receive timing characteristics.

Figure 88. 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) x (1/Fbaud_rate)

- Tref_clk

(3/16) x (1/Fbaud_rate)

+ Tref_clk

—

Table 90. IrDA Mode Receive Timing Parameters

Parameter

Symbol

Min

Max

Units

UA5

Receive Bit Time1 in IrDA mode

The UART receiver can tolerate 1/(16 x Fbaud_rate) tolerance in each bit. But accumulation tolerance in one frame must not

exceed 3/(16 x Fbaud_rate).

tRIRbit

1/Fbaud_rate

2 - 1/(16

x Fbaud_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 x

Fbaud_rate)

—

UA6

Receive IR Pulse Duration

tRIRpulse

1.41 us

(5/16) x (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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