NUMICRO-SDK Nuvoton Technology Corporation of America, NUMICRO-SDK Datasheet - Page 387

• Manufacturer Part Number: NUMICRO-SDK
• Description: KIT EVAUATION NUC100/120/130/140
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™r
• Type: MCUr

Specifications of NUMICRO-SDK

• Contents: Board, Cable, CD, Nu-Link
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: NUC100, NUC120, NUC130, NUC140

5.12.4 IrDA Mode
5.12.4.1 IrDA SIR Transmit Encoder
5.12.4.2 IrDA SIR Receive Decoder
5.12.4.3 IrDA SIR Operation
The UART supports IrDA SIR (Serial Infrared) Transmit Encoder and Receive Decoder, and IrDA
mode is selected by setting the IrDA_EN bit in UA_FUN_SEL register.
When in IrDA mode, the UA_BAUD [DIV_X_EN] register must disable.
Baud Rate = Clock / (16 * BRD) , where BRD is Baud Rate Divider in UA_BAUD register.
The following diagram demonstrates the IrDA control block diagram.
The IrDA SIR Transmit Encoder modulate Non-Return-to Zero (NRZ) transmit bit stream output
from UART. The IrDA SIR physical layer specifies use of Return-to-Zero, Inverted (RZI)
modulation scheme which represent logic 0 as an infra light pulse. The modulated output pulse
stream is transmitted to an external output driver and infrared Light Emitting Diode.
In normal mode, the transmitted pulse width is specified as 3/16 period of baud rate.
The IrDA SIR Receive Decoder demodulates the return-to-zero bit stream from the input detector
and outputs the NRZ serial bits stream to the UART received data input. The decoder input is
normally high in the idle state. (Because of this, IRCR bit 6 should be set as 1 by default)
A start bit is detected when the decoder input is LOW
The IrDA SIR Encoder/decoder provides functionality which converts between UART data stream
and half duplex serial SIR interface. The following diagram is IrDA encoder/decoder waveform:
NuMicro™ NUC100 Series Technical Reference Manual
UART
IRCR
RX
TX
BAUDOUT
IrDA_enable
SOUT
TX_select
INV_RX
INT_TX
SIN
Figure 5-70 IrDA Block Diagram
IrDA
SIR
IR_SOUT
- 387 -
IR_SIN
RX pin
TX pin
Publication Release Date: Oct 22, 2010
Transceiver
IR
Detect Infra red ray
Emit Infra red ray
Revision V1.06