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The processor can regain the buses only after the Hold is removed. Soon as the completion of the current machine cycle. The microprocessor (CPU) upon receiving the Hold request. HOLD indicates that another MASTER is requesting the If READY is low, CPU will wait for READY to go HIGH before completing the read or write cycle. It indicates that memory or peripheral is ready to send or receive data. If this signal is high during a read or write cycle, The signal is synchronized to the processor clock.Īn output clock pin to drive the clock of the rest of the system. None of the other flags or registers are affected.ĬPU is held in reset condition as long as RESET is applied. It resets interrupt enable and HLDA flipflops. Reset sets the Program Counter (PC) to zero. It has highest priority of any interrupt. It is unaffected by any mask or interrupt enable. Input, TRAP interrupt is a nonmaskable restart interrupt. These interrupts have higher priority than INTR. RST 7.5 has highest priority, RST 5.5 has lowest priority. These are three inputs which has same timing as INTRĮxcept they cause internal RESTART to be automatically inserted. It can be used to activate 8259 interrupt chip or some other interrupt port. Output, Interrupt acknowledge It is used instead of RD during instructionĬycle after an INTR is accepted. It is disabled by reset and immediately after an interrupt is accepted. INTR is enabled and disabled by the software. It is used as a general purpose interrupt. The output SOD is set or reset as specified by SIM instruction. The data on this line is loaded into accumulator bit-7 whenever a RIM instruction The pins on 8085 chip can be grouped into 6 groups: It uses +5V supply and runs on maximum frequency of about 3 MHz. Refer functions of all the 8085 pins below in the table.Ĩ085 microprocessor has 40 pins.
#MEMORY INTERFACING IN 8085 MICROPROCESSOR PDF SERIAL#
Serial I/O Controller and Power Supply unit as shown in the figure.Īll these hardware modules as part of 8085 architecture have been shown in the figure with its
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➨The other three units are Interrupt Controller, Increment/Decrement Register, Address Latch, Address/Data Latch. General purpose regsiters, stack pointer(SP), program counter(PC), ➨Instruction Unit consists of Instruction register, Instruction Decoder, ➨Processing Unit consists of ALU, Accumulator, Status FLags and Temporary Register. Processing unit, instruction unit, storage and interface unit. The 8085 architecture consists of above mentioned registers, flags and counters.įigure:1 8085 Microprocessor Architecture block diagramįigure-1 depicts internal architecture of 8085 microprocessor.īroadly 8085 architecture consists of three units viz. The 8085 chip is 8-bit general purpose microprocessor which can address Let us understand 8085 microprocessor architecture with its internal modules or units. It uses +5V supply voltage for its operation. The major features of 8085 chip are 8 bit data bus, 16 bit address bus,ģ.072 MHz internal clock frequency, 40 pin configuration etc. The intel 8085 is 8 bit size microprocessor produced by Intel in the year 1976. Stack pointer, Instruction register, memory address register, control register etc. The 8085 architecture consists of control unit, ALU, registers, accumulator, flags, program counter, This 8085 architecture describes 8085 microprocessor internal modules with block diagram. 8085 Architecture | architecture on 8085 Microprocessor