EZ80F91MCU Datasheet, PDF (223/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
204
Infrared Encoder/Decoder
The eZ80F91 device contains a UART to an infrared encoder/decoder (endec).
The endec is integrated with the on-chip UART0 to allow easy communication
between the CPU and IrDA Physical Layer Specification Version 1.4-compatible
infrared transceivers, as illustrated in Figure 36. 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
eZ80F91
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 36. Infrared System Block Diagram
Functional Description
When the endec 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 infrared
transceiver. Likewise, data received from the infrared transceiver is decoded by
the endec and passed to the UART. Communication is half-duplex, meaning that
simultaneous data transmission and reception is not allowed.
The baud rate is set by the UART Baud Rate Generator, which supports IrDA
standard baud rates from 9600 bits/s to 115.2 KBPS. Higher baud rates are possi-
PS019209-0504
PRELIMINARY
Infrared Encoder/Decoder