I'm new to assembly language and have written an instruction sequence for the MC68HC12 ,to input a string of characters using the SCI channel 0. The input character string, will be no more than 20 characters, and will be stored in memory when an EOT character is received.
Port A bit 0 will be used for parity error detection.

The serial data transfer will be performed according as follows;
o 19,200 baud (P clock is 8 MHz)
o one start bit, 8 data bits, one stop bit
o polled output
o idle line wakeup
o short idle line mode
o no loop back
o characters should be encoded using odd parity

Is this the correct approach and how would I add an interrupt driven input?