USART/UART IrDA and Smartcard Support

by <a href="http://community.silabs.com/t5/Welcome-and-Announcements/Community-Ranking-System-and-Recognition-Program/m-p/140490#U140490"><font color="#000000"><font size="2">Hero Employee</font></font> </a> Silicon_Labs on ‎03-12-2012 05:58 PM - edited on ‎09-25-2017 03:26 AM by Administrator Siliconlabs
Question

 

What does it mean that the USART/UART modules support IrDA and Smartcard?  Do these features require the synchronous capability of the USART?




Answer

 

In IrDA mode, a 0 causes a low (or high) pulse for a configurable bit time (1/16, 1/8, 3/16, or 1/4). A 1 does not cause a pulse. The Smartcard support consists of the ability to capture or send a Smartcard ACK or NACK response during the stop bit periods.


 


Neither of these modes require the synchronous capability of the USART modules. As a result, all of the USART and UART modules have both IrDA and Smartcard support.