T iming diagrams of 8085
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1) Timing diagrams display the initiation and transfer of read/write and data operations under the control of status signals like IO/M, S1, and S0, with the clock signal CLK controlling the proper operation. 2) The microprocessor divides each instruction into a fetch cycle and execute cycle as it processes instructions sequentially stored in memory. 3) For example, when fetching the opcode 41H stored at memory location 2105H, the microprocessor sets IO/M low and S1 and S0 high to indicate a fetch, sends the 16-bit address on the address bus, and uses control signals like RD to read the opcode from memory and transfer it to the instruction register for decoding.
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P1 wants to enter critical section
P1 calls wait(s)
If s == 1, then P1 enters critical section
Else P1 must wait
P2 also wants to enter critical section
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P2 must wait as s is already 0
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Read/Write control logic:
The Read/Write Control logic interfaces the 8251A with CPU, determines the functions of the 8251A according to the control word written into its control register.
It monitors the data flow.
This section has three registers and they are control register, status register and data buffer.
The active low signals RD, WR, CS and C/D(Low) are used for read/write operations with these three registers.
When C/D(low) is high, the control register is selected for writing control word or reading status word.
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Arm chap 3 last
P1 wants to enter critical section
P1 calls wait(s)
If s == 1, then P1 enters critical section
Else P1 must wait
P2 also wants to enter critical section
P2 calls wait(s)
P2 must wait as s is already 0
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Structural hazard
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The document discusses the timing diagram of the 8085 microprocessor. It explains that a timing diagram is a graphical representation of the execution time of each instruction. It then describes the different machine cycles of the 8085 including the opcode fetch cycle, memory read cycle, memory write cycle, I/O read cycle, I/O write cycle, and interrupt acknowledge cycle. It provides details on the T-states within each machine cycle and examples of timing diagrams for different instructions like STA, IN, OUT, MVI, INR and ADD. Finally, it lists several references used to collect information on the 8085 timing diagram.
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It means various components or devices those are connected to CPU. Actually these are input output devices. Thus, it sometimes calls as I/O devices.
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1. Using a program counter to fetch instructions from memory and reading register operands.
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3. Building a datapath with functional units for instruction fetching, ALU operations, memory references, and branches/jumps.
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Read/Write control logic:
The Read/Write Control logic interfaces the 8251A with CPU, determines the functions of the 8251A according to the control word written into its control register.
It monitors the data flow.
This section has three registers and they are control register, status register and data buffer.
The active low signals RD, WR, CS and C/D(Low) are used for read/write operations with these three registers.
When C/D(low) is high, the control register is selected for writing control word or reading status word.
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2. RESET IN pin which is used to reset the microprocessor and RESET OUT pin which outputs a reset signal.
3. Serial I/O pins SID and SOD which are used for serial data input and output respectively.
4. Address and data bus pins including AD0-AD7 for the lower byte and A8-A15 for the upper byte. Control signals such as ALE, IO/M, RD and WR are also described.
5 pin-diagram-of-8085-181203034237
The document provides information about the pin diagram of the 8085 microprocessor. It describes the various pins including:
1. Clock input pins X1 and X2 which are used to generate internal clock signals.
2. RESET IN pin which is used to reset the microprocessor and RESET OUT pin which outputs a reset signal.
3. Serial I/O pins SID and SOD which are used for serial data input and output.
4. Address and data bus pins including A8-A15 for higher order address and AD0-AD7 which serve as both the lower order address and data bus.
Control signal pins such as IO/M, ALE, RD,
UNIT 1 Microprocessors.pptx
The document provides information about the 8085 microprocessor, including its architecture, features, instruction formats, and addressing modes. The 8085 is an 8-bit microprocessor with an accumulator, registers, arithmetic logic unit (ALU), flags, and I/O controls. It has three types of instructions that are 1, 2, or 3 bytes long. The addressing modes allow instructions to specify operands and include immediate, direct, register, register indirect, and implicit modes.
Plc
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The document discusses timing diagrams and machine cycles in the 8085 microprocessor. It provides details on the different machine cycles - opcode fetch, memory read, memory write, I/O read, and I/O write. It explains that the 8085 has a clock signal divided into T-states that represent portions of machine cycle operations. Examples are given of timing diagrams for instructions like MOV B,C, MVI B,43, and STA 526A to illustrate the sequence of events over multiple T-states.
A word processor would most likely be used to do which of the following
A word processor would most likely be used to do which of the following
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T iming diagrams of 8085
- 1. TIMING DIAGRAMS OF 8085
- 2. INTRODUCTION • Timing diagram is the display of initiation of read/write and transfer of data operations under the control of 3-status signals IO / M , S1, and S0. • The CLK is required for the proper operation of different sections of the microprocessors. • The microprocessor is controlled by either leading or trailing edge of the clock.
- 4. PROCESSOR CYCLE • The function of the microprocessor is divided into fetch and execute cycle of any instruction of a program. • The program is nothing but number of instructions stored in the memory in sequence.
- 5. INSTRUCTION FETCH AND EXECUTE = ADI 05H
- 6. OPCODE FETCH
- 7. MEMORY READ
- 8. MEMORY WRITE
- 9. I/O READ
- 10. I/O WRITE
- 11. TIMING DIAGRAM OF OPCODE FETCH Fetch a byte 41H stored at memory location 2105H • A low IO/M means microprocessor wants to communicate with memory. • The μP sends a high on status signal S1 and S0 indicating fetch operation. • The μP sends 16-bit address. AD bus has address in 1st clock of the 1st machine cycle,T1. • AD7 to AD0 address is latched in the external latch when ALE = 1. AD bus now can carry data. • In T2, the RD control signal becomes low to enable the memory for read operation. • The memory places opcode on the AD bus. The data is placed in the data register (DR) and then it is transferred to IR. • During T3 the RD signal becomes high and memory is disabled. • During T4 the opcode is sent for decoding and decoded in T4.
- 12. STA is a write instruction.
- 13. LDA is a read instruction
- 14. MOV B,C
- 15. MVI B,05H
- 16. IN C0H
- 17. INR M H-42 L-50 4250H-12H