Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
Z8 Encore!®
97
16-clock
period
Baud Rate
Clock
UART’s
TXD
Start Bit = 0
Data Bit 0 = 1
Data Bit 1 = 0
Data Bit 2 = 1
Data Bit 3 = 1
3-clock
pulse
IR_TXD
7-clock
delay
Figure 72. Infrared Data Transmission
Receiving IrDA Data
Data received from the infrared transceiver via the IR_RXD signal through the RXD pin is
decoded by the Infrared Endec and passed to the UART. The UART’s baud rate clock is
used by the Infrared Endec to generate the demodulated signal (RXD) that drives the
UART. Each UART/Infrared data bit is 16-clocks wide. Figure 73 illustrates data recep-
tion. When the Infrared Endec is enabled, the UART’s RXD signal is internal to the
Z8F640x family device while the IR_RXD signal is received through the RXD pin.
PS017610-0404
Infrared Encoder/Decoder
ZILOG [ ZILOG, INC. ]
