Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 168

• Manufacturer Part Number: Z8FMC04100
• Description: Z8 Encore-R Motor Control Flash MCUs
• Manufacturer: ZILOG [Zilog, Inc.]

146
Z8 Encore!
Product Specification
Infrared Encoder/Decoder
Baud Rate
UART’s
IR_TxD
Clock
TxD
Transmitting IrDA Data
®
Motor Control Flash MCUs
to the UART. Communication is half-duplex, which means simultaneous data transmis-
sion 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, 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. Figure 20 illustrates IrDA data transmis-
sion. When the infrared endec is enabled, the UART’s TXD signal is internal to the
Z8FMC16100 Series Flash MCU while the IR_TXD signal is output through the
Infrared Data Rate (bits/s) =
7-Clock
Delay
Start Bit = 0
16-Clock
3-Clock
Period
Pulse
Figure 20. Infrared Data Transmission
Data Bit 0 = 1
P R E L I M I N A R Y
16 x UART Baud Rate Divisor Value
System Clock Frequency (Hz)
Data Bit 1 = 0
Data Bit 2 = 1
Data Bit 3 = 1
PS024604-1005
TXD
pin.