simplest micro controller - Electronic Circuits Projects Diagrams Free

hamm3rst0rm · 16th August 2007, 03:11 PM

can anyone help me to build a simplest micro controller?

**3v0** · 16th August 2007, 05:34 PM

Too general of a question.

You can use a PIC and ignore the ADC and other peripherals. One with an internal oscillator like the PIC16F88 would be a good choice. It has more pins but it is not more complicated to use then a device with less pins.

Papabravo · 17th August 2007, 12:13 AM

A back of the envelope calculation says you should be able to do an 8-bit processor with discrete IC's in about 75 in^2 which given a typical density 0.8 in^2 per DIP IC equivalent is about 94 IC's.

Do you have the stones to design, draw the schematic, and keep track of that many IC's? If you do I would start with a 74xx181 Arithmetic Logic Unit. Then I would decide what to use for registers and memory. You'll probably need some rudimentary I/O like switches and lights and maybe a UART or two. I guess using a UART would be kinda cheating though. Rack up another handful of chips.

You may as well invest in a digital scope with at least a 16-channel logic analyzer. Unless you're way better at debuging than the guy I learned from you'll have a really hard time with a design that complicated.

BTW -- Good Luck

**3v0** · 17th August 2007, 01:39 AM

Gosh I misunderstood what the OP wanted. I was thinking he wanted to build a simple target card....

If one were to build one ICs would not be my first choice.

philba · 17th August 2007, 02:17 AM

Since you can get a really good deal on transistors in 1K quantities, I'd build it from transistors. Create a one-hot controller. Simple adders should only take a few hundred transistors.

Of course, I suspect 3vo is right but with such a vague question, it's more more fun to techno-run-amok!

simrantogether · 17th August 2007, 06:22 AM

hey,

you cannot build a microcontroller.. you can only buy that...

only the people who know VLSI designs that ant the factory makes that...

buy.. Atmel's 89s51 or 52 microcontroller...

regards..

simran..

**3v0** · 17th August 2007, 12:23 PM

Quote:

Originally Posted by philba

Since you can get a really good deal on transistors in 1K quantities, I'd build it from transistors. Create a one-hot controller. Simple adders should only take a few hundred transistors.

The Intel 4004 used 2,300 MOS transistors, it the first ever microprocessor was a 4 bit part.

yngndrw · 17th August 2007, 01:12 PM

Lots and lots on NAND gates.

http://www.play-hookey.com/digital/adder.html <-- Binary adder with carry.

Edit: Or http://cpuville.4t.com/index.htm

simrantogether · 17th August 2007, 01:37 PM

Quote:

Originally Posted by 3v0

The Intel 4004 used 2,300 MOS transistors, it the first ever microprocessor was a 4 bit part.

You remember.. once einstein said.. " everything should be simple but not the simplest"..

that means.. we also want some facilities along with simplicity...

hence.. follow.. 8051..

better if you buy its new edition.. Atmel's 89c51..

regards..

simran

**Nigel Goodwin** · 17th August 2007, 01:43 PM

Quote:

Originally Posted by simrantogether

You remember.. once einstein said.. " everything should be simple but not the simplest"..

that means.. we also want some facilities along with simplicity...

hence.. follow.. 8051..

better if you buy its new edition.. Atmel's 89c51..

Or better still buy a PIC or AVR, something a little more modern than antique 8051's

No disrespect, but it only seems to be India that posts questions about 8051's?.

Hero999 · 17th August 2007, 01:58 PM

I read about building a processor out of BC549s someone in the Internet but I can't find it.

Although it's pointless for any practical purpose, it seem like a good project and if you do it well it'd get you a good in any degree level digital electronics course.

simrantogether · 17th August 2007, 02:00 PM

Quote:

Originally Posted by 3v0

The Intel 4004 used 2,300 MOS transistors, it the first ever microprocessor was a 4 bit part.

You remember.. once einstein said.. " everything should be simple but not the simplest"..

that means.. we also want some facilities along with simplicity...

hence.. follow.. 8051..

better if you buy its new edition.. Atmel's 89c51..

regards..

simran

philba · 19th August 2007, 05:45 AM

This is a funny thread.

OP asks an unanswerable question so a couple of jokers (like me) poke a little fun at him. Then people get serious about the silly responses and start debating them. We even get reptitious postings. OP, in the mean time, has gone silent and is probably laughing about the whole thing.

**3v0** · 19th August 2007, 06:56 AM

Does a lack of interest on the part of the OP or that fact that a thread is 2 years old makes it any less interesting ?

yngndrw · 19th August 2007, 05:35 PM

Two years old ?? The first post was: 16th August 2007, 04:11 PM :S

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16th August 2007, 03:11 PM	(permalink)
hamm3rst0rm	simplest micro controller can anyone help me to build a simplest micro controller?

16th August 2007, 05:34 PM	(permalink)
3v0	Too general of a question. You can use a PIC and ignore the ADC and other peripherals. One with an internal oscillator like the PIC16F88 would be a good choice. It has more pins but it is not more complicated to use then a device with less pins. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, Homepage The 15 Minute Printed Circuit Board! (+drill time)

17th August 2007, 12:13 AM	(permalink)
Papabravo	A back of the envelope calculation says you should be able to do an 8-bit processor with discrete IC's in about 75 in^2 which given a typical density 0.8 in^2 per DIP IC equivalent is about 94 IC's. Do you have the stones to design, draw the schematic, and keep track of that many IC's? If you do I would start with a 74xx181 Arithmetic Logic Unit. Then I would decide what to use for registers and memory. You'll probably need some rudimentary I/O like switches and lights and maybe a UART or two. I guess using a UART would be kinda cheating though. Rack up another handful of chips. You may as well invest in a digital scope with at least a 16-channel logic analyzer. Unless you're way better at debuging than the guy I learned from you'll have a really hard time with a design that complicated. BTW -- Good Luck

17th August 2007, 01:39 AM	(permalink)
3v0	Gosh I misunderstood what the OP wanted. I was thinking he wanted to build a simple target card.... If one were to build one ICs would not be my first choice. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, Homepage The 15 Minute Printed Circuit Board! (+drill time)

17th August 2007, 02:17 AM	(permalink)
philba	Since you can get a really good deal on transistors in 1K quantities, I'd build it from transistors. Create a one-hot controller. Simple adders should only take a few hundred transistors. Of course, I suspect 3vo is right but with such a vague question, it's more more fun to techno-run-amok!

17th August 2007, 06:22 AM	(permalink)
simrantogether	hey, you cannot build a microcontroller.. you can only buy that... only the people who know VLSI designs that ant the factory makes that... buy.. Atmel's 89s51 or 52 microcontroller... regards.. simran..

17th August 2007, 01:12 PM	(permalink)
yngndrw	Lots and lots on NAND gates. http://www.play-hookey.com/digital/adder.html <-- Binary adder with carry. Edit: Or http://cpuville.4t.com/index.htm Last edited by yngndrw; 17th August 2007 at 01:16 PM.

17th August 2007, 01:58 PM	(permalink)
Hero999	I read about building a processor out of BC549s someone in the Internet but I can't find it. Although it's pointless for any practical purpose, it seem like a good project and if you do it well it'd get you a good in any degree level digital electronics course. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

19th August 2007, 05:45 AM	(permalink)
philba	This is a funny thread. OP asks an unanswerable question so a couple of jokers (like me) poke a little fun at him. Then people get serious about the silly responses and start debating them. We even get reptitious postings. OP, in the mean time, has gone silent and is probably laughing about the whole thing.

19th August 2007, 06:56 AM	(permalink)
3v0	Does a lack of interest on the part of the OP or that fact that a thread is 2 years old makes it any less interesting ? __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, Homepage The 15 Minute Printed Circuit Board! (+drill time)

19th August 2007, 05:35 PM	(permalink)
yngndrw	Two years old ?? The first post was: 16th August 2007, 04:11 PM :S