The JNB instruction consumes 2 instruction cycles to determine that the flag is not set and jump over the unnecessary ... The RETI instruction does the same thing as a RET instruction, but tells the 8051 that an interrupt routine has finished.
|Title||:||Microcontroller: Features and Applications|
|Author||:||D. S. Yadav, Arun Kumar Singh|
|Publisher||:||New Age International - 2004|