What could be the equivalent code for the below code snippet
// Set up RX interrupts, but only if we have a valid RX baud rate
*digitalPinToPCICR(_receivePin) |= _BV(digitalPinToPCICRbit(_receivePin));
*digitalPinToPCMSK(_receivePin) |= _BV(digitalPinToPCMSKbit(_receivePin));
tunedDelay(_tx_delay); // if we were low this establishes the end
What should i do for interrupt? where can i get some ideas about interrupt enabling?