z16f2811 ZiLOG Semiconductor, z16f2811 Datasheet - Page 183

• Manufacturer Part Number: z16f2811
• Description: High Performance Microcontrollers
• Manufacturer: ZiLOG Semiconductor

PS022006-0207
Baud Rate
IR_TXD
UART’s
Clock
TXD
Transmitting IrDA Data
7-clock
delay
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 below 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, a 3-clock high pulse is
output following a 7-clock low period. After the 3-clock high pulse, a 6-clock low pulse is
output to complete the full 16-clock data period.
transmission. When the Infrared Endec is enabled, the UART’s TXD signal is internal to
the ZNEO Z16F Series products while the IR_TXD signal is output through the TXD pin.
Start Bit = 0
Infrared Data Rate (bps)
16-clock
3-clock
period
pulse
Figure 32. Infrared Data Transmission
Data Bit 0 = 1
P R E L I M I N A R Y
=
Data Bit 1 = 0
--------------------------------------------------------------------------------------------- -
16 UART Baud Rate Divisor Value
×
System Clock Frequency (Hz)
Figure 32
Data Bit 2 = 1
illustrates IrDA data
Infrared Encoder/Decoder
Product Specification
ZNEO
Data Bit 3 = 1
™
Z16F Series
169