0
Intel 8085
Introduced by Intel in 1977, the Intel 8085 is an 8-bit microprocessor that is binary-compatible with Intel 8080. It only requires a +5-volt power supply and has been used as a microcontroller.
1,493 Questions
no i have a lot of games for a good share of emulators for different systems.
What do you mean by multiplexing the bus?
If you have less no of data than the no of bits of data or address to b transfer Multiplexing mean to manage given busses in such a way that data or address can be transferred perfectly
What is the function of interrupt acknowledge pin in 8085 micro processor?
The INTA- (Interrupt Acknowledge) pin on the 8085 is an acknowledge of the INTR (Interrupt Request). It has the same timing as RD-, and external hardware is expected to provide an opcode, usually a CALL or an RST instruction, in response to INTA-.
What is machine cycle and the steps to draw timing diagram?
A machine cycle is three or more T cycles used to perform a memory / IO read or write, or an interrupt acknowedge
- Draw a square clock oscillator waveform of at least 3 cycles, more if you want to show READY timing.
- Each T cycle starts at the falling edge of clock, with the first T cycle starting with ALE.
- Draw an ALE pulse, one half clock cycle, inverted and slightly delayed from clock.
- Approximately 1/3 into ALE, draw the IO/M-, S0, S1, and A8-A15 lines becoming valid. They stay valid for the duration of the cycle.
- Approximately 1/3 into ALE, draw the AD0-AD7 lines becoming valid as A0-A7. Note that external logic must strobe these lines on the falling edge of ALE. The AD0-AD7 lines remain valid for about 1 clock cycle.
- On the second T cycle, draw the RD-, WR-, or INTA- lines becoming valid. The determination is known in advance if one looks at IO/M-, S0, and S1. They are valid for 1.5 clock cycles, except see READY logic below.
- Show the READY line being sampled in the rising edge of clock after ALE falls. If READY is false at that point, T2 will be repeated until READY is sampled true.
- As noted AD0-AD7 float 1/2 clock cycle after ALE. 1/2 clock cycle later, they become D0-D7, and drive for WR- or stay floating for RD- or INTA-.
- External logic is expected to strobe D0-D7 data at the rising edge of WR-. D0-D7 will remain valid for 1/2 clock beyond WR-.
- External logic is expected to drive D0-D7 during RD- or INTA-. The processor will strobe D0-D7 1/2 clock cycle before the rising edge of RD- or INTA-.
- Note: Address to read data valid timing is 2 clock cycles, and address to write data valid timing is 2.5 clock cycles. The difference is due to who controls the AD0-AD7 bus, and when it gets strobed.
- 1/2 clock cycle after RD-, WR-, or INTA-, at the rising edge of clock, the machine cycle ends. Depending on whether or not internal processing must be done, ALE may or may not be emitted, starting another machine cycle.
- HOLD is sampled on the falling edge of clock in the third T cycle. If recognized, HLDA is asserted 1/2 clock cycle later, 1/2 clock cycle later, the whole control bus floats so another bus master can take over.
What is the function of processor status word in 8085?
Processor status word ( PSW ) in the case of 8085 refers to the collection of the values of the flag register and accumulator.
It is used with the command push: PUSH PSW
With this command, the proccessor saves the value of accumulator (A) and the values of the flag bits to the stack.
How does LHLD transfer insruction work in Intel 8085?
it stands for load HL pair with data from the specified location in the register. eg. LHLD 9200
Aditi Misra
3rd yr,B.tech,CSE
Netaji Subhash Engineering College
What is an explanation of the 8288 Bus controller?
inteT 8288 BUS CONTROLLER FOR iAPX 86, 88 PROCESSORS Bipolar Drive Capability Provides , The Intel"' 8288 Bus Controller is a 20-pin bipolar component for use with medium-to-large iAPX 86, 88 , ). ÂËN I Address Enable: AEN enables command outputs of the 8288 Bus Controller at least 115ns after , of two ways dependent on the mode of the 8288 Bus Controller. I/O Bus Mode - The 8288 is in the I/O , no arbitration is present. This mode allows one 8288 Bus Controller to handle two external busses. No ... OCR Scan
datasheet
7 pages,
239.68 Kb
multiprocessor 8089 intel 8288 bus generator 8288 8284 clock generator pin diagram of 8288 bus controller 8288 bus controller signal 8288 bus controller by intel intel 8288 bus controller intel 8288 8288 bus controller datasheet abstract
datasheet frame
Abstract: 8288 Bus Controller DISTINCTIVE CHARACTERISTICS g • Bipolar drive capability • Multi-master or I , OPTION Not Applicable c. DEVICE NUMBER/DESCRIPTION 8288 Bus Controller b. PACKAGE TYPE P = 20-Pin , HIGH. This mode allows one 8288 Bus Controller to handle two external buses. This allows the CPU to , , the 8288 functions in the I/O Bus mode. When LOW, the 828B functions in the System Bus mode. 12 AIOWC , to read a Cascade Address from a master Priority Interrupt Controller onto the data bus. PDEN (IOB ...
What is the importance of an internal data bus?
Buses are just conductors to carry data from one place to another place in terms of microprocessor from one register to another register.
Regards,
Rajper
Sears mail order sold it. They were manufactured by Savage.
What is the use of command MOV A A in 8085 microprocessor?
The MOV A,A instruction in the 8085 does nothing, not even change flags. It only consumes time, specifically four clock cycles plus applicable wait states.
What is the difference between stack pointer and program counter?
The stack pointer keeps track of the top of the stack used by the current thread. The program counter keeps track of the next instruction in a program. Both are registers and both store a memory address.
Flag Register (PSW)
- Status is indicated with individual bits:
- 0 - CF - Carry Flag
- 2 - PF - Parity Flag
- 4 - AF - Auxiliary carry Flag
- 6 - ZF - Zero Flag
- 7 - SF - Sign Flag
- 8 - TF - Trap Flag
- 9 - IF - Interrupt Flag
- 10 - DF - Direcetion Flag
- 11 - OF - Overflow Flag
How do you save from a register to a memory bit in assembler?
how to save in assembly registrar for to call in program to compare in tasm
The name 8085 was given to the next generation of the 8080 to indicate 1.) that it was a next generation device and 2.) that it only required a single +5V power supply to operate.
That isn't exactly a question, but if it were, the answer would be "true".
How do you know the starting and ending address of E000H in segment register?
The starting and ending addresses of segment E000H is E0000H and EFFFFH.
How do you register for the series 63 exam?
First, you need to check some requirements you need to fulfill that will comply to FINRA's(Financial Industry Regulatory Authority) requirements and then after that find an approved and accredited series 63 licensing exam provider online or in a local school. You can also try to take a preparatory course that will help you to easily pass the actual series 63 license exam.
Write 8085 program on bubble sort algorithm?
The basic algorithm for a bubble sort requires a boolean indicator. As the program cycles through the array to be sorted, it steps by one and compares n and n+1. If n+1 is greater than n, then they are swapped, the boolean indicator is set to false and the comparator increments by one. Once the comparator makes a complete cycle through without the indicator flagging to false, the array is sorted.
