FDC37C935-QS Standard Microsystems (SMSC), FDC37C935-QS Datasheet - Page 80

• Manufacturer Part Number: FDC37C935-QS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C935-QS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

The infrared interface provides a two-way
wireless communications port using infrared as
a
implementations have been provided for the
second UART in this chip (logical device 5),
IrDA and Amplitude Shift Keyed IR.
transmission can use the standard UART2 TX
and RX pins or optional IRTX2 and IRRX2 pins.
These can be selected through the configuration
registers.
IrDA allows serial communication at baud rates
up to 115K Baud. 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.
signaled by sending no IR pulse during the bit
time.
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
transmission
Please refer to the AC timing for the
start
bit.
medium.
A
zero
is
INFRARED INTERFACE
Two
A one is
signaled
The IR
IR
80
by sending a 500KHz waveform for the duration
of the serial bit time.
sending no transmission 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
transfered 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 four character times.
A character time is defined as 10 bit times
regardless of the actual word length being used.
A one is signaled by