USB Help Needed - Electronic Circuits Projects Diagrams Free

bronzedbison · 1st May 2008, 11:40 AM

I need to know how to use the D+ and D- pins for USB communication on the Atmel ATC51 series µCs, specifically wrt opcode (datasheet and user manual don't have much). If anyone has any useful links/info on this, I'd really appreciate it if you could post it here. Thanks.

lexter · 1st May 2008, 12:50 PM

the d+ and d- are used for differential data transmission (or whatever it is called in english, sory, not native). The meaning of that is that when d+ is high, d- is low and vice versa. Also, there are standards for cross-points of the signals, etc. You can find it @ www.usb.org the document, which you need is called "ellectrical characteristics" and considered to be the most borring piece of text to read.

bronzedbison · 1st May 2008, 01:06 PM

Thanks for the info, lexter. I'll look into it

ikalogic · 2nd May 2008, 10:03 AM

I don't think 8051 can do it, specially not one like the AT89C51, because the processor throughput wont be enough... the nearest alternative would be an AVR like the ATMEGA16

lexter · 2nd May 2008, 03:06 PM

well, I've heard that you can do USB with Microchip PIC family ... Which looks like a very good alternative to 8051 ...

not sure, though.

**Nigel Goodwin** · 2nd May 2008, 04:42 PM

Quote:

Originally Posted by lexter

well, I've heard that you can do USB with Microchip PIC family ... Which looks like a very good alternative to 8051 ...

not sure, though.

Some PIC's have internal USB hardware (mostly 18F series and above), but AVR's can do it as well, apparently there are examples on AVRFreaks.

Super_voip · 2nd May 2008, 07:23 PM

depending on what else you need to do with the 8051, the TI CC1111 has USB, single cycle instructions and a 3 ISM band transciever for around US$4.50. You just can't buy them at the moment as they seem to be very popular.

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1st May 2008, 11:40 AM	(permalink)
bronzedbison	USB Help Needed I need to know how to use the D+ and D- pins for USB communication on the Atmel ATC51 series µCs, specifically wrt opcode (datasheet and user manual don't have much). If anyone has any useful links/info on this, I'd really appreciate it if you could post it here. Thanks.

1st May 2008, 12:50 PM	(permalink)
lexter	the d+ and d- are used for differential data transmission (or whatever it is called in english, sory, not native). The meaning of that is that when d+ is high, d- is low and vice versa. Also, there are standards for cross-points of the signals, etc. You can find it @ www.usb.org the document, which you need is called "ellectrical characteristics" and considered to be the most borring piece of text to read.

1st May 2008, 01:06 PM	(permalink)
bronzedbison	Thanks for the info, lexter. I'll look into it

2nd May 2008, 10:03 AM	(permalink)
ikalogic	I don't think 8051 can do it, specially not one like the AT89C51, because the processor throughput wont be enough... the nearest alternative would be an AVR like the ATMEGA16 __________________ Ibrahim Kamal check my electronics and robotics page: http://www.ikalogic.com/

2nd May 2008, 03:06 PM	(permalink)
lexter	well, I've heard that you can do USB with Microchip PIC family ... Which looks like a very good alternative to 8051 ... not sure, though.

2nd May 2008, 07:23 PM	(permalink)
Super_voip	depending on what else you need to do with the 8051, the TI CC1111 has USB, single cycle instructions and a 3 ISM band transciever for around US$4.50. You just can't buy them at the moment as they seem to be very popular.