Z8F082A28100KIT ZILOG [Zilog, Inc.], Z8F082A28100KIT Datasheet - Page 123

• Manufacturer Part Number: Z8F082A28100KIT
• Description: Z8 Encore XP-R F08xA Series with eXtended Peripherals
• Manufacturer: ZILOG [Zilog, Inc.]

:
PS024705-0405
Baud Rate
IR_TXD
UART’s
Clock
TXD
Transmitting IrDA Data
Infrared Data Rate (bits/s)
7-clock
delay
is passed to the Infrared Endec through the RXD pin, decoded by the Infrared Endec, and
passed to the UART. Communication is half-duplex, which means simultaneous data
transmission and reception is not allowed.
The baud rate is set by the UART’s Baud Rate Generator and supports IrDA standard baud
rates from 9600 baud to 115.2 Kbaud. Higher baud rates are possible, but do not meet
IrDA specifications. The UART must be enabled to use the Infrared Endec. The Infrared
Endec data rate is calculated using the following equation:
The data to be transmitted using the infrared transceiver is first sent to the UART. The
UART’s transmit signal (TXD) and baud rate clock are used by the IrDA to generate the
modulation signal (IR_TXD) that drives the infrared transceiver. Each UART/Infrared
data bit is 16 clocks wide. If the data to be transmitted is 1, the IR_TXD signal remains
low for the full 16 clock period. If the data to be transmitted is 0, the transmitter first out-
puts a 7 clock low period, followed by a 3 clock high pulse. Finally, a 6 clock low pulse is
output to complete the full 16 clock data period. Figure 16 illustrates IrDA data transmis-
sion. When the Infrared Endec is enabled, the UART’s TXD signal is internal to the Z8
Encore! XP
pin.
Start Bit = 0
16 clock
period
3 clock
pulse
®
F08xA Series products while the IR_TXD signal is output through the TXD
Figure 16.Infrared Data Transmission
Data Bit 0 = 1
P R E L I M I N A R Y
=
--------------------------------------------------------------------------------------------- -
16 UART Baud Rate Divisor Value
Data Bit 1 = 0
×
System Clock Frequency (Hz)
Data Bit 2 = 1
Z8 Encore! XP
Product Specification
Infrared Encoder/Decoder
Data Bit 3 = 1
®
F08xA Series
105