Contents of registers when 8085 is powered on?

@gauravbhorkar-Pf9kZD • Oct 22, 2024

Oct 22, 2024

1.1K

When we power on the 8085 microprocessor kit, all the memory locations contain garbage values.

Is it the same case with registers (A, B, C, D, E, H, L)? Do they contain garbage values or they contain all zeroes?

I have heard that the flag register is always initialized to zero, when 8085 is powered on. WHat about other registers?

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shiwa436

@shiwa436-h94d47 • Feb 25, 2011

These registers will have the previous values, which are stored in them while last used.
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gaurav.bhorkar

@gauravbhorkar-Pf9kZD • Feb 25, 2011

I guess, you didn't get my question. I want to know the contents of Registers when we turn on (or switch on) the microprocessor. Are they garbage values of zeroes?
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gaurav.bhorkar

@gauravbhorkar-Pf9kZD • Feb 28, 2011

Does anyone have an answer ?
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Reya

@reya-SMihdC • Mar 2, 2011

@Jonusb3: Do you think your post is related to the topic???If so,please explain me!
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PraveenKumar Purushothaman

@praveenkumar-66Ze92 • Mar 2, 2011

They are reset with some arbitrary values! Check them out... 😀
All are hex values. Got it from my Microprocessor Lecturer... 😁
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Reya

@reya-SMihdC • Mar 2, 2011

@Praveen: Do you mean that the content of registers will have arbitrary values when we turn ON the microprocessor??
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PraveenKumar Purushothaman

@praveenkumar-66Ze92 • Mar 2, 2011

They get refreshed... Arbitrary in the sense, garbage values, which are hexadecimal in nature.
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shubhankar

@shubhankar-CeulhT • Mar 2, 2011

they are garbage values. totally vague values.
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PraveenKumar Purushothaman

@praveenkumar-66Ze92 • Mar 2, 2011

shubhankar
they are garbage values. totally vague values.
I second you!

@praveena211 This is what I said... 😀
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gaurav.bhorkar

@gauravbhorkar-Pf9kZD • Mar 3, 2011

Thank you all. Actually this was needed for my project.

The values in registers are indeed garbage values when we turn on the MP. But I also came to know that a lot depends on the MP kit's manufacturer, many kits reset those garbage values to zeros when the MP is turned on.
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PraveenKumar Purushothaman

@praveenkumar-66Ze92 • Mar 4, 2011

You can also do it electronically purging when the memory starts... 😀
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gaurav.bhorkar

@gauravbhorkar-Pf9kZD • Mar 4, 2011

praveenscience
You can also do it electronically purging when the memory starts... 😀
ah.. not sure of what you are talking about.
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PraveenKumar Purushothaman

@praveenkumar-66Ze92 • Mar 4, 2011

You know how to erase EEPROM? The same method... Electric purging...
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gaurav.bhorkar

@gauravbhorkar-Pf9kZD • Mar 4, 2011

hmm..
I'm still new in this field.

Thanks by the way!
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PraveenKumar Purushothaman

@praveenkumar-66Ze92 • Mar 4, 2011

Dude, am not in that field at all!!! Lolz... 😁
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