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indirect addressing in this addressing mo e also ne of the operands is the stored in the memory the memory address of the
direct addressing in this addressing mode one of the operands is the data stored in the memory the memory address of
immediate addressing in this addressing mode that 816 bit data is specified in the instruction itself as its one of
register addressing in this mode the operand are microprocessors registers only i e the operations is performed within
trap has the maximum prioritythere are 2 types of interrupts external and internal nmi has highest priority between all external interruptstrap has
addressing model as we have learned already that each instruction has two parts one is op code and another is operand op
the five addressing modes are given belowimmediateregisterdirectimplied addressing modes register
sub instruction op code format is of sub instruction isreplace the three bit code of the register r from to obtain the op
there are total 12 interrupts in 8085 there are total 12 interrupts in 8085
add instruction op code format of add instruction isreplace the three bit code of the register r from to obtain the op code
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
op code format as we have seen in the section that the first byte of all the instruction is the op code microprocessors
three byte instruction the instruction which have 16 bit data address as its operand are three byte instruction they
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
instruction size as we have seen already that each instruction has two partsopcode operation code which tells the types of
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
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