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Questions tagged [microprocessor]

The microprocessor is an integrated circuit that elaborates information in the form of digital signals. Not to be confused with a microcontroller, which embeds many additional devices to control embedded systems.

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How many stall cycles resulted by incorrectly predicted branch in instruction pipelining

I have been solving following exercise problem from book Computer Organization by Patterson and Hennessy: The importance of having a good branch predictor depends on how often conditional branches ...
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0answers
35 views

Acceleration of sequential computation over time

I am looking for a model (or "law", as in Moore's law) to describe the acceleration of sequential computation over time. By sequential computation I mean, for example, repeated applications of a hash ...
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2answers
31 views

STM32L4R5xx Different Pins Same Function

I am working with a STM32L4R5LQFP144 microprocessor right now. I'm trying to use the SPI1 with several sensors. I understand that the SCK on the slave needs to be connected to SPI1_SCK pin on the ...
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1answer
125 views

Why RST instructions are called one byte call instruction in 8085 [closed]

Why RST instructions are called one byte call instruction in 8085 ?
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20 views

eMMC host controller question

i have a eMMC v5.1 chip from Samsung,and i have a emmc controller v4.5 is possible my controller support eMMC this version ? whats eMMC version? lower controller version could support higher version ?...
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1answer
71 views

How to understand “Power Up Checksum” in embedded system?

For an Embedded hardware system, how do we understand the "Power Up Checksum" in the initialization part? How does it work in detail? (Where does it check, what is the mechanism) A "Power Up ...
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1answer
48 views

What is address allocation of memory register? [closed]

What is ment by address allocation of memory register in microprocessor and memory topic or in computer architecture? Memory chips are have no processing elements(passive elements). How memory chips ...
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1answer
82 views

What is the composition of CPU chip

What are each of those components on the chip?
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1answer
45 views

In ADCs, what is the number of conversions per sequence?

I'm dealing with a microcontroller's Analog to Digital Converter (ATD_10B8C) that has a control register who's bit values determine the "number of conversions per sequence". What exactly does this ...
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1answer
80 views

Why do I need to read/write from/to EEPROM in embedded applications? [closed]

What is the usage of the EEPROM in embedded application? can you give me examples?
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2answers
256 views

24 bit adc to read +/-10V analog input signal

I need to read a sensor data which gives analog output(range is +10V to -10V) and convert it to digital form using 24 bit ADC and then store it to a memory card. I have some experience with PIC ...
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1answer
53 views

Customzing the Arduino Mini Pro 3.3V/8Mhz. What component can I remove from the original circuit?

I am trying to custom design my own microcontroller circuit and want to eventually embed it into my system. I decided to use an Arduino Mini Pro 3.3V/8Mhz provided from Sparkfun and the links for the ...
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2answers
79 views

Are memory-mapped registers actually implemented as real registers?

I am currently trying to better understand microcontroller-architectures and I am particularly studying the ARM cortex-m3 right now. What I have always wondered is, if memory mapped registers are ...
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1answer
30 views

How much is VLIW power- and area-efficient then superscalar anyway?

Most of texts say VLIW, which is lack of hardware to detect hazards and schedule the instructions. But I haven't see any evaluation about how much VLIW can save area(h/w complexity) and power compared ...
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53 views

How much is VLIW power- and area-efficient then superscalar anyway? [duplicate]

Most of texts say VLIW, which is lack of hardware to detect hazards and schedule the instructions. But I haven't see any evaluation about how much VLIW can save area(h/w complexity) and power compared ...
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1answer
79 views

What is a RTOS, is it embedded or do I need to install? (MSP430) [closed]

First of all, I have the basic knowledge in low-level programming of microprocessors but I don't have the in-depth details which I need. I have never worked with RTOS before in my previous class. Now ...
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0answers
97 views

Can a PC motherboard be used as an uber microcontroller?

I'm aware of the differences between a common microcontroller and a full blown motherboard from a computer server. But consider what happens when the PC memory testing tool memtest86 is run:- Here ...
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1answer
51 views

Analog Blackfin Processor Silicon Revision issue [closed]

Recently we got a large batch of ADSP-BF5346s that say they are Silicon Rev 3 but internally read as Rev 2. Is there a way for me to determine the Silicon Revision number on the rest of the shipment ...
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1answer
125 views

Help identifying a microprocessor?

I've recently started trying to reverse engineer my old car's ECU (2001 Holden Jackaroo/Isuzu Trooper with a 3.0L diesel 4jx1 engine), purely as a learning experience. I've managed to identify and ...
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2answers
118 views

Designing an IoT product [closed]

This is more of a general question of the embedded electronics industry. At the moment I'm planning on building a device with a similar requirement to the Nest products. Essentially, I want to have a ...
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0answers
34 views

Atmel Image Sensor interface

I'm working on Microchip SAMA5D27SOM Evaluation kit platform. I'm trying to interface TVP5150AM1 Video decoder to image sensor controller(Atmel-ISC) interface of the processor. I have configured the ...
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2answers
429 views

16 bit Graphics Chip [closed]

I am trying to build a 16 bit single board computer based around the 68000 and am wondering if there are any non proprietary 16 bit graphics chips like the Yamaha V9958 with readily available ...
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2answers
77 views

redundant output pins from MCU

I am analyzing a board with safety considerations. In one part of the circuit, PB0 and PB1 of MCU have been logical anded using an IC (PB0 && PB1). Does anyone have faced with such ...
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1answer
38 views

Read/write logic in IC8259

I was studying about 8259A from the Intel documentation of Intel 8259A. What I came across was that the Read/Write Logic has an input from control logic.In all other ICs that I have seen, this is ...
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4answers
3k views

Maximum number of opcodes for a microprocessor

What is the maximum number of opcodes for the question, the answer is c option, but i think it is option d, because, each address specifies each memory location, there are 16 address lines, which ...
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1answer
48 views

Stack RAM and data RAM of 8085

Where is the Stack RAM and data RAM located in the block diagram of 8085 microprocessor ? I am unable to find it in block diagram .
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1answer
274 views

Exchange instruction of 8085 microprocessor

How XCHG instruction is executed by 8085 microprocessor ? By default XCHG instruction takes place between DE pair and HL pair. Suppose let us assume contents of DE pair is replaced by the contents of ...
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1answer
87 views

Will 8 bit addition in 8085 gives 16 bit result?

If two 8 bit numbers are added in 8085 microprocessor, will it give 16 bit result, if so where it will be stored, because Accumulator can store only 8 bit.
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1answer
62 views

Memory access at microprocessors

I just learned about memory segmentation that is used in microprocessors and I was told that old microprocessors like Intel 8086 had 20 lines of address bus which means that it could access 2^20 ...
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0answers
29 views

ALE and PSEN example waveforms - are highs and lows “flat enough”?

Sorry if this is a silly question. All of my waveforms (square, rectangle, pulse) exhibit the kind of behavior in the image where the highs and lows are not super-flat. Clock is 18MHz and these ...
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1answer
77 views

How the first programming language and compiler was made? [closed]

How to get access to processor?I know that our OS don't allow to do that. Can we delete our OS to get the access?
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2answers
159 views

Inserting an FPGA on a MIPI camera lane [closed]

I have a processor which accepts MIPI data. However, the problem is I want to perform some processing on this data and the IMX6 is not fast enough to do this in real time. I was wondering what is the ...
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3answers
3k views

How do processors control their clock speed?

I recently came across an STM processor with 2 oscillators on the circuit - I suppose one for high-speed operation and the other for low power. For something like a desktop processor where the clock ...
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1answer
1k views

JL (or maybe something else) misterious branded IC's [closed]

Take a look at this example of an IC found on a circuit board: Brand is found on many PCB's of Chinese/India manufacturers of different kind of devices, mostly consumer based. For example, there are ...
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1answer
53 views

Thermal overload trip in chips

I have read that the thermal design power (TDP) is an important metric while considering energy and power trade off related to microcontrollers. It is said that TDP determines the cooling required and ...
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2answers
2k views

What is a Programmer's Model?

The manual of a computer processor usually includes a description of something called programmer's model. This section normally presents the core registers of the processor, operating modes, ...
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1answer
66 views

floating pins in arduino [closed]

i have an arduino board when i use analogeread to read the value of A0 without connecting any wire to it ,gives me a value not zero in serial monitor. is my arduino dead or what is the problem? i ...
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0answers
605 views

STM32L4 bootloader unable to enter application

I've been following bootloader guide here and trying to write a bootloader that simply turns an LED on when entering a pushbutton-induced performFirmwareUpdate(). I'm using the ARM GNU toolchain in ...
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1answer
34 views

I-type register format maximum size of a constant

The above picture is an I-type format register. I am confused as to why the largest constant possible is $$2^{15}$$ Should the largest possible constant be $$2^{16} -1$$
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1answer
391 views

Clarification on R, I, and J type Instruction formats in MIPS

I would like some clarification on some concepts of register types, to know if I understand it correctly. If I had a 32-bit CPU. Would that mean that the max number of operations that can be ...
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0answers
78 views

Correct way to address less than 32 bit ranges in a MIPS processor

I am designing a 32 bit MIPS processor in VHDL. Currently, our design restricts our instruction memory to only 64 32-bit locations, aka first 8 bits of the 32 bit address. We are trying to decide on ...
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2answers
257 views

Video compression using low power processor

I'm trying to build a hand held camera with video recording feature. Basic features of camera are Resolution: 640x480 Frame rate: 25/30Hz Video format from sensor: 8-bit grey scale BT.656 (Sensor ...
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8answers
2k views

Measure square waves without oscilloscope?

I have a Z80 which is misbehaving and want to check the signals. However I do not own an oscilloscope, so I'm looking for another way of checking the square waves on the pins. I basically just need ...
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1answer
168 views

Shared UART on STM32F103x (or any)

This is one of those beginner questions, so sorry about that. I'm trying to add wireless chip to my current PCB, but there are no more available UARTs on STM32F103. There is one UART (RX,TX) pins "...
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0answers
43 views

How to set unused bit-5 of flag register to 1 in 8085 without affecting any other flag? [duplicate]

Set only bit-5 of the flag register without changing others in 8085 microprocessor
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3answers
482 views

Finite State Machine Handling Timers Gracefully?

I've been working with mostly 8 bit MCUs, where most RTOSes are too much overhead. Most of the applications I've worked one have just been a periodic interrupt with if/else chains for all the ...
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3answers
806 views

What is the role of ISA (Instruction Set Architecture) in the comp arch abstraction stack. [closed]

I have programming background, and I recently started taking computer architecture course. Most of the lectures I see use the some sort of the layering as described in the following diagram explaining ...
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4answers
131 views

Linux on board without 3rd party modules. Where to start? [closed]

I would like to be able to design my own Linux board the way I design my own micro-controller boards. The complexity is obviously going to be higher from PCB design and assembly point of view, but I ...
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2answers
437 views

Why do micro controllers run @ 100's MHz whilst CPUs run @ GHz? [closed]

Whoopie - I've got a Raspberry Pi. When doing stuff it runs @ 1.2GHz and there are Uber overclockers out there who have boosted them to 1.5GHz (with phase change coolers). Today, the cheapest CPU on ...
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1answer
93 views

High Level Synthesis of a Microprocessor [closed]

I am working at an FGPA shop right now using Xilinx FPGAs. I do not have a ton of experience with designing logic, especially when it comes to microprocessors. One of the big movements my team is ...