SPEAR1340 datasheet(187/200 Pages) STMICROELECTRONICS

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SPEAr1340

Timing characteristics

Doc ID 023063 Rev 4

187/200

5.16.1

IrDA timing characteristics

Figure 48 and Figure 49 show timing waveforms based on 1 start bit, 5 data bits and 1 stop

bit.

fBAUDRATE = the programmed baud rate frequency

tUARTCLK = 1/fUARTCLK

Figure 48.

IrDA transmit timing waveform

Figure 49.

IrDA receive timing waveform

Table 103.

IrDA transmit timing characteristics

Symbol

Parameter

Min

Max

Unit

tTXBIT

IrDA transmit mode bit duration

1/fbaudrate -

tUARTCLK -1

1/fbaudrate +

tUARTCLK +1

tTXPW

IrDA transmit mode pulse width, start bit

data bit value 0 (high pulse)

(3/16)*1/fbaudrate -

tUARTCLK -1

(3/16)*1/fbaudrate

+ tUARTCLK +1

Table 104.

IrDA receive timing characteristics

Symbol

Parameter

Min

Max

Unit

tRXBIT

IrDA receive mode bit duration

1/fbaudrate -

tUARTCLK -1

1/fbaudrate +

tUARTCLK +1

tRXPW

IrDA receive mode pulse width, start

bit data bit value 0 (low pulse)

(3/16)*1/fbaudrate

Start bit

Stop bit

tTXBIT

tTXPW

UART_TXD

(SIROUT)

Start bit

Stop bit

UART_RXD

(SIRIN)

tRXPW

tRXBIT

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