Timeline for Why do micro controllers run @ 100's MHz whilst CPUs run @ GHz? [closed]
Current License: CC BY-SA 3.0
22 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 28, 2021 at 20:31 | vote | accept | Paul Uszak | ||
| Jan 23, 2018 at 21:31 | comment | added | Criticizing Israel not allowed | @PaulUszak Are you saying microwaves made now should waste power, space and cost just in case future microwaves might need it? In any case you would probably not want the main CPU (which runs lots of complex software) controlling the magnetron for security and reliability reasons. You would still use a separate microcontroller or a hardware circuit for that. | |
| Jan 23, 2018 at 11:26 | comment | added | Paul Uszak | @old_timer What's confusing you with the question? It's seems fairly specific in asking why one brand of component runs >>10 times faster than another, yet contains exactly the same silicony bits... | |
| Jan 23, 2018 at 11:22 | comment | added | Paul Uszak | @immibis Why are you talking about a microwave? I was thinking about a Global Hawk UAV, Trident SLBM or a BMW 5 AMG. And just you wait till the marketing people invent an on-line web interfaced microwave that heats your ready meal when phoned as you're coming home. Wouldn't that be nice? | |
| Jan 23, 2018 at 7:58 | comment | added | MrGerber | MHz! MHz! Not mHz or mhz. /grumpy | |
| Jan 22, 2018 at 23:54 | history | closed |
Chris Stratton old_timer Arsenal Passerby user105652 |
Needs more focus | |
| Jan 22, 2018 at 23:14 | comment | added | Arsenal | @immibis no it needs 2,4 GHz to heat the water molecules ;-) | |
| Jan 22, 2018 at 23:13 | comment | added | Criticizing Israel not allowed | Does your microwave oven need a 1GHz processor? | |
| Jan 22, 2018 at 23:11 | answer | added | jonk | timeline score: 7 | |
| Jan 22, 2018 at 23:11 | comment | added | Arsenal | Doesn't this question have enough of an answer? | |
| Jan 22, 2018 at 23:01 | comment | added | TonyM | @old_timer, tons of good stuff here, in a few too many comments though - can you convert them into an answer | |
| Jan 22, 2018 at 23:01 | comment | added | Arsenal | @old_timer why not write an answer instead of ten comments covering the same? | |
| Jan 22, 2018 at 23:00 | answer | added | Simon B | timeline score: 3 | |
| Jan 22, 2018 at 22:50 | review | Close votes | |||
| Jan 22, 2018 at 23:55 | |||||
| Jan 22, 2018 at 22:37 | comment | added | old_timer | Take two/few AA batteries and see how long any of the pis runs with that as its source. Then take an mcu and see how long it runs with the same configuration of batteries. How long do the batteries in your tv remote control last? A battery powered atomic clock on the wall? | |
| Jan 22, 2018 at 22:34 | comment | added | old_timer | The name branded Ardunos are overpriced, where the pis are disturbingly low priced, or at least the pi-zero. Kind of like the stm32 blue pill which is lower than the price that most of us can buy just the microcontroller rather than the whole board. So you cant compare price either. | |
| Jan 22, 2018 at 22:32 | comment | added | old_timer | clock speed is no longer if has ever been a primary thing to focus on, processors running bloated/bulky operating systems want more Hz than mcus that are not as bloated, but you can certainly find someone running an operating system on a processor running slower than an mcu I can find. | |
| Jan 22, 2018 at 22:32 | comment | added | Eugene Sh. | Everything has it's own purpose. The back-loader manufacturer is not "cleverer" than a shovels manufacturer. It's just that you don't need a back-loader to clean the snow from your driveway. | |
| Jan 22, 2018 at 22:31 | comment | added | old_timer | an mcu usually carries much of its basic system baggage on chip, program storage, memory, primary peripherals and I/O. where a non-mcu even system on a chip doesnt normally carry all of that baggage, the set top box and cell phone processors like the pi uses, do carry quite a bit and are called system on a chip but there is still dram off chip (or package on package) and primary storage is off chip. in the case of the pi the network is off chip and some other small items. | |
| Jan 22, 2018 at 22:29 | comment | added | old_timer | The raspberry pi uses a processor/system designed to run an operating system, consumes considerably more power than a few (dozen) mhz mcu. Costs significantly more although you cant actually see that price difference between a branded arduino and a pi-zero for example. | |
| Jan 22, 2018 at 22:28 | comment | added | old_timer | How many tons can you haul in a smart car? What is the top speed of a dump truck relative to a sports car? Almost everything with a power switch these days (no need to list exceptions) has a processor in it. Various sizes. AVRs (arduinos) at 16Mhz are pretty slow by some MCU standards you can get MCUs in the small hundreds of mhz where my first computer was only a few mhz. | |
| Jan 22, 2018 at 22:25 | history | asked | Paul Uszak | CC BY-SA 3.0 |