z8f0813 ZiLOG Semiconductor, z8f0813 Datasheet - Page 124
z8f0813
Manufacturer Part Number
z8f0813
Description
High-performance 8-bit Microcontrollers
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z8F0813.pdf
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PS024314-0308
Baud Rate
IR_TXD
UART’s
Clock
TXD
Transmitting IrDA Data
7-clock
delay
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
outputs 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.
sion. When the Infrared Endec is enabled, the UART’s TXD signal is internal to
Z8 Encore! XP
TXD pin.
Start Bit = 0
16 clock
period
3 clock
Infrared Data Rate (bits/s)
pulse
®
Figure 17. Infrared Data Transmission
F0823 Series products while the IR_TXD signal is output through the
Data Bit 0 = 1
=
-------------------------------------------------------------------------------- -
16
Data Bit 1 = 0
×
System Clock Frequency (Hz)
UART Baud Rate Divisor Value
Figure 17
Data Bit 2 = 1
Z8 Encore! XP
displays IrDA data transmis-
Product Specification
Infrared Encoder/Decoder
Data Bit 3 = 1
®
F0823 Series
114
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