FIRQ - Fast Interrupt Request
        push PC and CC on System stack pointer

def push_firq_registers(self):
        """
        FIRQ - Fast Interrupt Request
        push PC and CC on System stack pointer
        """
        self.cycles += 1
        self.push_word(self.system_stack_pointer, self.program_counter.value) # PC
        self.push_byte(self.system_stack_pointer, self.get_cc_value())