sign flag
parity flag
zero flag
flags controls procesore
5 FLAGS
Flags are kind of register that record the condition of a microprocessor's calculation process.
A loop in a microprocessor, like any loop in any programming language, is a series of instructions that is executed repeatedly until some condition is satisfied. An example of a delay loop in the 8085 might be... . PUSH FLAGS . XRA A L INR A . JNZ L . POP FLAGS This piece of code, with a 1 MHz clock, will take about 4.6 mS to execute, and it will save and restore the accumulator and flags.
The NOP instruction is short for no-operation. It is an executable instruction that does nothing to the processor, its registers, or its flags. It is useful in timing loops, or to provide room for patchabilty of a piece of code.
RET pops the PC off of the stack, while IRET pops both the flags and the PC off of the stack.
The MOV A,A instruction in the 8085 does nothing, not even change flags. It only consumes time, specifically four clock cycles plus applicable wait states.
How does a microprocessor decode?
ADD B in a microprocessor means to add the contents of the accumulator to the B register and store the result in the accumulator. Flags are set according to the result - Z if zero, C if an unsigned carry occurred, AC if a BCD carry occurred, N if the result is signed negative, O if the parity is odd, OV if a signed overflow occurred. Note that not every microprocessor has every flag listed.
The moon crescent on the bottom of certain flags is often a symbol of Islam, representing the lunar calendar used in Islamic traditions. It is commonly seen on flags of Muslim-majority countries and signifies the importance of the Islamic faith in those nations.
The plural of microprocessor is microprocessors.
Microprocessor is a single chip processor.