•OV: (Overflow flag) is set after an addition or
subtraction operation if
there was an arithmetic overflow. Results greater than +127 or less than –128 will set OV bit.
•P: (Parity Bit) automatically set or cleared each
machine cycle to
establish even parity with the accumulator. Parity bit is most commonly used in conjunction with serial port routines
to include a parity bit
before or after the transmission.
•RS1 & RS0 are used to select different register