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the maximum clock frequency for 8085 is 3
mov instructionop code format of mov instruction is as follows replace the codes of destination register and source register with
rst 45 is known as trap rst 45 is known as trap
op code format as we have seen in the section that the first byte of all the instruction is the op code microprocessors
flag is known as low order register amp accumulator is known as high order register
yes it can be used if an accurate clock frequency is not needed also the component cost is low contrast to lc or crystal
three byte instruction the instruction which have 16 bit data address as its operand are three byte instruction they
why address bus is unidirectional and data bus is bidirectionalans because there is no require address transaction among processor and peripheral
two byte instructions in these instruction the first byte specifies the operations code and the second byte specifies the
one byte instructions one byte instruction include both the opcode operand in the same byte to identify one byte instruction
i think yesso if 8259 gives interrupt then it will be serviced instantly but since into pin is left hanging the insr bit will never be setand so
instruction size as we have seen already that each instruction has two partsopcode operation code which tells the types of
why the temporary registers w and z are named so i mean we start from abcde then h and l coz h stands for higher bit nd l for lower bit of the
sphl load stack pointer with hl instructionthis instruction copies the contents of hl register pair the stack pointer register
xthl exchange top of the stack with hl instruction the contents of top two location of the stack are exchanged with the contents of
pop psw instruction it is similar to above pop instruction but instead of normal register pairs it uses psw as its operand
pop instructionthis instruction copies the contents of the top two locations of the stack into the specified register
push psw instruction it is similar to above push instruction but instead of normal register paris it use psw as its operand program
what is the logical difference among move a to b and compute b aans in case of move a to b it will move whatever the value of a in to bit mean it
push instructionthis instruction copies the contents of the specified register pair into the stack the contents of
load stack pointer this instruction loads the stack pointer register with the 16 - bit data specified in the instruction the
stack operationstack is a group of memory locations which are part of the same read write memory used for storing data
object repository means not a set of objectsits a common repository for all the people testing developers for seeing all the data in one loginfor
microprocessor is a program-controlled device which fetches the instructions from memory decodes and implements the instructions most micro processor
rim read interrupt mask instructionthis instruction is used to read the status of interrupts and read the serial