CIRCC datasheet(17/70 Pages) SMSC

17 / 70 page

IrDA SIR AND SHARP ASK IR INTERFACE

This interface uses the ACE UART to provide a

two-way wireless communications port using

infrared as a transmission medium. Two distinct

implementations have been provided in this block

of the CIrCC, IrDA SIR and Sharp ASK IR.

IrDA SIR allows serial communication at baud

rates up to 115K Baud.

Each word is sent

serially beginning with a zero value start bit.

Sending a single infrared pulse at the beginning

of the serial bit time signals a zero.

A one is

signaled by sending no infrared pulse during the

bit time. Please refer to Figure 8-Figure 11 for

the parameters of these pulses and the IrDA

waveform.

The SHARP ASK interface allows asynchronous

amplitude shift keyed serial communication at

baud rates up to 19.2K Baud. Each word is sent

serially beginning with a zero value start bit. A

zero is signaled by sending a 500kHz waveform

for

the

duration

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 ASKIR 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 time-out 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 time-out is programmable up to a

maximum of 10ms through the IR Half-Duplex

Time-Out Configuration Register. Note: The IR

Half Duplex Timeout is disabled in hardware

when the CIR decoder is configured for wake-up.

CIRCC Datasheet(PDF) 17 Page - SMSC Corporation

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