FDC37M607 datasheet(80/182 Pages) SMSC

80 / 182 page

INFRARED INTERFACE

The

infrared

interface

provides

two-way

wireless communications port using infrared as

transmission

medium.

Two

implementations have been provided for the

second UART in this chip (logical device 5),

IrDA and Amplitude Shift Keyed IR.

The IR

transmission can use the standard UART2

TXD2 and RXD2 pins or optional IRTX and

IRRX pins. These can be selected through the

configuration registers.

IrDA allows serial communication at baud rates

up to 115.2 Kbps.

Each word is sent serially

beginning with a zero value start bit. A zero is

signaled by sending a single IR pulse at the

beginning of the serial bit time.

A one is

signaled by sending no IR pulse during the bit

time.

Please refer to the AC timing for the

parameters of these pulses and the IrDA

waveform.

The Amplitude Shift Keyed IR allows serial

communication at baud rates up to 19.2K Baud.

Each word is sent serially beginning with a zero

value

start

bit.

zero

signaled

sending a

500KHz

waveform

for

the

duration of the serial bit time. A one is signaled

by sending no transmission during the bit time.

Please refer to the AC timing for the parameters

of the ASK-IR waveform.

If the Half Duplex option is chosen, there is a

time-out when the direction of the transmission

is changed. This time-out starts at the last bit

transferred during a transmission and blocks the

receiver input until the timeout expires. If the

transmit buffer is loaded with more data before

the time-out expires, the timer is restarted after

the new byte is transmitted.

If data is loaded

into the transmit buffer while a character is

being received, the transmission will not start

until the time-out expires after the last receive

bit has been received. If the start bit of another

character is received during this time-out, the

timer is restarted after the new character is

received.

The

half

duplex

time-out

programmable via CRF2 in Logical Device 5.

This

allows

the

time-out

programmed to any value between 0 and

10msec in 100usec increments.

FDC37M607 Datasheet(PDF) 80 Page - SMSC Corporation

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