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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
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