EZ80L92MCU Datasheet, PDF (137/241 Pages) Zilog, Inc. – eZ80Acclaim Flash Microcontrollers

eZ80L92 MCU
Product Specification
122
Infrared Encoder/Decoder
The eZ80L92 MCU contains a UART to infrared encoder/decoder (endec). The infrared
encoder/decoder is integrated with the on-chip UART0 to allow easy communication
between the eZ80^® CPU and IrDA Physical Layer Specification Version 1.3 compliant
infrared transceivers as illustrated in Figure 24. Infrared communication provides secure,
reliable, high-speed, low-cost, point-to-point communication between PCs, PDAs, mobile
telephones, printers and other infrared enabled devices.
System
Clock
eZ80L92
UART0
RxD
TxD
Baud Rate
Clock
Infrared
Encoder/Decoder
IR_RxD
IR_TxD
Infrared
Transceiver
RxD
TxD
Interrupt I/O Data
Signal Address
To eZ80 CPU
I/O Data
Address
Figure 24. Infrared System Block Diagram
Functional Description
When the infrared encoder/decoder is enabled, the transmit data from the on-chip UART
is encoded as digital signals in accordance with the IrDA standard and output to the infra-
red transceiver. Likewise, data received from the infrared transceiver is decoded by the
infrared encoder/decoder and passed to the UART. Communication is half-duplex mean-
ing that simultaneous data transmission and reception is not allowed.
The baud rate is set by the UART Baud Rate Generator and supports IrDA standard baud
rates from 9600 bits/s to 115.2 Kbps. Higher baud rates are possible, but do not meet IrDA
specifications. The UART must be enabled to use the infrared encoder/decoder. Refer to
PS013012-1004
PRELIMINARY
Infrared Encoder/Decoder