I read somewhere that Microchip might be relewasing a range of chips with
inbuilt USB interfaces (20xxx I think it was).
Does anyone have any info?
e.g. When will they be out?
What speed USB?
Will there be hardware support for the USB standard?
How many endpoints?
I don't have any info on this. But have a workaround to use USB with
See Phillips USB friendly chips:
netQ <innocent.com> netquake
"Home of amateur PIC programmers..."
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> Microchip have specification sheets available on a couple of parts
> (16c745/765), but they are still listed as future products. Perhaps
> someone can any recommend another architecture? I have heard that
> Cypress USB MCUs have 50% of the USB market at this time; anyone have
> any experience with them? I have seen Phillips mentioned a couple of
> times too I think; any comments?
It really depends upon your design, and what you currently know and
I've recently started connecting the Philip's PDIUSBD11 (USB Interface
Device with Serial Interface) to Microchip's 16F877. This allows the
ability to use USB on your favorite PIC architecture. The 16F877 has
the Master I2C Synchronous Serial Port, thus I've hanged the PDIUSBD11
This design is going along quite well, minus a little set back with
erratic programming of the PIC16F877 which is driving me up the wall.
Previously, I used the Cypress CY7C63001 packaged in the popular USB
Starter Kit (CY3640). Not being familiar with the instruction set or
architecture on this beast, I spent a little while learning a new
device. This didn't pay of at the end, as I dumped the Cypress
Controller for other reasons. Most of the Cypress parts are Windowed
I must say, I've always been a Motorola Person thus I looked in this
direction (68HC705JB4 / JB4). I could never source them. . . . . That
fixed that. Speaking of sourcing components, I also found the Philips
hard to come by. I ended up buying a MOQ of 22 pcs.
The Motorola and Cypress alternatives have very little in the range of
emulators / debugging.
If you already have the development tools for the PIC's and the
knowledge, I would consider dropping a PDIUSBD11 off it's I2C Port. Fair
Enough, the USB registers aren't mapped into memory like the Cypress and
Motorola USB MCU's and there is a little (read considerable) overhead
regarding the 1MBit/s I2C Serial Interface but it's definitely a good
starting point. Plus, if you choose the 16F8xx you have the ICD to help
you along and the advantage of a Flash device. (I don't let know if it's
wise to recommend the F87x parts.)
The other advantage is, provided you take a modular approach to your
code, you can develop it now for the PDIUSBD11 and when Microchip
releases their USB MCU's you can modify the low level routines to use
the new devices.
Interfacing the PC -
Information on Serial / RS232 Ports, Parallel, ECP, EPP
Ports, IRQ's, and AT Keyboards, USB & Device Drivers.
Thank you for all the information. It is very much appreciated.
I will admit that I am not keen on porting my entire system to the
Cypress MCUs, especially since I will still need to hang something off
of it (A/D). I also agree with you completely about the advantage of
being able to port USB code from Philips to PIC. However, since the
PDIUSB11 are 3.3V devices (which means that I will need more
regulation), require a 12 MHz crystal, seem to be difficult to get a
hold of (Marshal has a *56* day lead time), all coupled with the fact
that I can get my hands on a Cypress USB Starter Kit (which includes a
programmer) easily (and free), already have a UV eraser, and don't think
I can handle any more supplier issues, I think I will actually try the
Cypress USBs first (it may take a couple of months to get the PDIUSBD11
anyway). How's that for [lack of] logic? I only wish Microchip would get
their act together and release their USB MCUs; after all, it's not as if
USB has been some sort of industry secret or anything. Thanks again.
Craig Peacock wrote:
William Chops Westfield
I believe the cypress "Easy-USB" controllers are 8051 compatible (from
the Anchor acquisition.)
I had tried to avoid contacting Microchip for the information because
they can sometimes take quite long to answer (I imagine, like everyone
else, they are somewhat overworked).
However, Microchip has gotten back to me, and have indicated that they
now estimated that PIC USB MCUs (16c745 and 16c765) samples will be
available in March or April. Yes, I mean the year 2000.
I'm not sure if this was widely know, but it was news to me.
Craig Peacock wrote:
You are entitled to your own opinions; you are not entitled to your own
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