It is a non-maskable interrupt, having the highest priority among all interrupts. In 8085 Instruction set, SPHL is an instruction with the help of which Stack Pointer will get initialized with the contents of register pair HL. For example: TRAP. Interrupt are classified into following groups based on their parameter −. DEC's VAX 9000, 2. The processing speed is high It requires a 5-volt power supply. As an example, let us consider, that initial contents of HL and SP register pairs are AABBH and CCDDH. RST0, RST1, RST2, RST3, RST4, RST5, RST6, and RST7. Interrupts are the signals generated by the external devices to request the microprocessor to perform a task. Hardware interrupt − There are 5 interrupt pins in 8085 used as hardware interrupts, i.e. Summary − So this instruction SPHL requires 1-Byte, 1-Machine Cycle (Opcode Fetch) and 6 T-States for execution as shown in the timing diagram. TRAP, RST 7.5, RST 6.5, RST 5.5, and INTR. However, it requires less support circuitry, allowing simpler and less expensive microcomputer systems to be built. Note − NTA is not an interrupt, it is used by the microprocessor for sending acknowledgement. TRAP, RST7.5, RST6.5, RST5.5, INTA. Let us take a look at the programming of 8085 Microprocessor. Non-Vector interrupt − In this type of interrupt, the interrupt address is not known to the processor so, the interrupt address needs to be sent externally by the device to perform interrupts. 8085 Microprocessor. It was designed in order to allow the assembly language for the 8008. The microprocessor checks the status of INTR signal during the execution of each instruction. CRAY Research Y-MP family, 4. 8086 type was also designed by Intel. TRAP has the highest priority, then RST7.5 and so on. Include in Super Minis … Maskable interrupt − In this type of interrupt, we can disable the interrupt by writing some instructions into the program. The Intel 8085 ("eighty-eighty-five") is an 8-bit microprocessor produced by Intel and introduced in March 1976. 8 bit microprocessor is more suitable for playing games and using short term programs, and 16 bit microprocessor is helpful for word processing, payroll, business accounts. Vector interrupt − In this type of interrupt, the interrupt address is known to the processor. For example: RST7.5, RST6.5, RST5.5. Hitachi's S-810/20, etc. Then after execution of instruction SPHL, HL and SP both will become AABBH. It is connected... Arithmetic and logic unit. New kinds of instructions were added in this microprocessor and microcoded divide and multiply instructions. RST0, RST1, RST2, RST3, RST4, RST5, RST6, and RST7. 8080. This type of microprocessor was developed using NMOS technology. When the INTR signal is high, then the microprocessor completes its current instruction and sends active low interrupt acknowledge signal. Software interrupt − In this type of interrupt, the programmer has to add the instructions into the program to execute the interrupt. When INTR signal goes high, the following events can occur −. It is a maskable interrupt. For example: LDB 5000K: means the data at address 5000K is copied to register B. It also has 6-bit registers which are arranged in pairs BC, DE and HL. But it is not a very common and regularly usable instruction as well. For example: MOV K, B: means data in register B is copied to register K. In this mode, the data is directly copied from the given address to the register. Bydefault, it is enabled until it gets acknowledged. In PC, it has been used two types of microprocessor such as 8 bit microprocessor or 16 bit microprocessor. Consider the following vectors: A vector processor adds all the elements of vector A and Vector B using a single vector instruction with hardware approach. Instruction sets are instruction codes to perform some task. Examples of vector processors are: 1. Due to this advantage, SPHL can be useful when SP is required to get initialized to a specific value a number of times in a program. It was released between the years 1976 to 1978. It is a software-binary compatible with the more-famous Intel 8080 with only two minor instructions added to support its added interrupt and serial input/output features. A vector is an array of operands of the same type. These are the instructions used to transfer the data from one register to another register, from the memory to the register, and from the register to the memory without any alteration in the content. It is a maskable interrupt, having the third highest priority among all interrupts. A vector processoris designed for vector computations. Now let us discuss the addressing modes in 8085 Microprocessor. For example: INTR. The result of execution of this instruction has been depicted in the following tracing table −, The timing diagram against this instruction SPHL execution is as follows −. Non-Maskable interrupt − In this type of interrupt, we cannot disable the interrupt by writing some instructions into the program. Instruction type SPHL in 8085 Microprocessor Microprocessor 8085 In 8085 Instruction set, SPHL is an instruction with the help of which Stack Pointer will get initialized with the contents of register pair HL. There are many companies like Intel, Motorola, DEC (Digital Equipment Corporation ), TI (Texas Instruments) associated with many microprocessors such as 8085 microprocessors, ASIC, CISM, RISC, DSPs and 8086 microprocessors like Intel. TRAP, RST7.5, RST6.5, RST5.5, INTA. In case of failure, it executes as ISR and sends the data to backup memory. It occupies only 1-Byte in memory, compared to the other instruction LXI SP instruction, which is 3-Bytes long used for initializing SP on the other hand. Instruction type XTHL in 8085 Microprocessor, Instruction type NOP in 8085 Microprocessor, Instruction type XCHG in 8085 Microprocessor, Instruction type CMC in 8085 Microprocessor, Instruction type STC in 8085 Microprocessor, Instruction type RLC in 8085 Microprocessor, Instruction type RAL in 8085 Microprocessor, Instruction type RRC in 8085 Microprocessor, Instruction type RAR in 8085 Microprocessor, Instruction type INX SP in 8085 Microprocessor, Instruction type DCX SP in 8085 Microprocessor, Instruction type DAD SP in 8085 Microprocessor, Instruction type LDA a16 in 8085 Microprocessor, Instruction type STA a16 in 8085 Microprocessor, Instruction type LDAX rp in 8085 Microprocessor, Initializing SP register with HL register pair content. This interrupt transfers the control to the location 0024H. There are 5 interrupt signals, i.e. When this interrupt is executed, the processor saves the content of the PC register into the stack and branches to 003CH address. Write a program to arrange first 10 numbers from memory address 3000H in an ascending order. Advantages and Disadvantages of Microprocessors. The advantages of microprocessors are. For example: RST7.5, RST6.5, RST5.5, TRAP. For example: CMP. It is a maskable interrupt, having the lowest priority among all interrupts. Addressing modes in 8085 is classified into 5 groups −. When this interrupt is executed, the processor saves the content of the PC register into the stack and branches to 0034H address. There are 8 software interrupts in 8085, i.e. In this mode, the 8/16-bit data is specified in the instruction itself as one of its operand. It has an 8-bit data bus, 16-bit address bus, 16-bit program counter, and stack counter. 8086 Microprocessor. It is an indirect way of initializing the stack pointer. 8085 Microprocessor – Functional Units Accumulator. Note − NTA is not an interrupt, it is used by the microprocessor for sending acknowledgement. There are 8 software interrupts in 8085, i.e. In this mode, the data is transferred from one register to another by using the address pointed by the register. When instructions are received, then the microprocessor saves the address of the next instruction on stack and executes the received instruction. It is a maskable interrupt, having the second highest priority among all interrupts. For example: MVI K, 20F: means 20F is copied into register K. In this mode, the data is copied from one register to another. IBM 390/VF, 3. 8085 was designed by Intel in 1977. As the name suggests, it performs arithmetic and logical operations like Addition,... General purpose register. Hardware interrupt − There are 5 interrupt pins in 8085 used as hardware interrupts, i.e. 8086 Microprocessor: This is more advanced that 8085 microprocessor as it has 16 bit microprocessor chip. It can be disabled by resetting the microprocessor. For example: MOV K, B: means data is transferred from the memory address pointed by the register to the register K. This mode doesn’t require any operand; the data is specified by the opcode itself. A small program or a routine that when executed, services the corresponding interrupting source is called an ISR. It is an 8-bit register used to perform arithmetic, logical, I/O & LOAD/STORE operations. It is classified into five categories. It is an indirect way of initializing the stack pointer. When this interrupt is executed, the processor saves the content of the PC register into the stack and branches to 002CH address.
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