On Sun, May 26, 2013 at 07:46:38AM -0400, Bob Camp wrote: > Hi > On May 25, 2013, at 11:26 PM, Herbert Poetzl <herb...@13thfloor.at> wrote:
>> On Sat, May 25, 2013 at 09:26:02PM -0400, Bob Camp wrote: >>> Hi >>> I realize this is a bit like water torture - sorry about that. >>> If I go to Microchip Direct and ask for a PIC 18F with two >>> UARTS and two A/D's I get the PIC18F86J72 and PIC 18F87J72. >>> To me the second one is the obvious winner. It's got twice >>> the flash for next to nothing more money. 1-25 piece price is >>> $6.04. >>> Same search, 1 A/D, 4 UARTS, lowest cost this time. PIC18F65J94 >>> is the winner. Lowest price package is $3.30 in 1-25 pieces. >> 4 UARTS are untypical for PICs and result in higher price >> as the device usually has more pins (which makes them more >> expensive) > The ARM that the thread was looking at was a 6 UART / 4 A/D > part. Thus the "load up the UARTS". Also the starting point > for all this did involve serial i/o. I have no idea for what 'home' project you would make good use of 6 UARTs, but please don't get me wrong, I'm using a lot of ARM/MIPS microcontrollers and devices here, and I appreciate that they got really cheap over the years. But for many applications, the inevitable overhead (power, heat, external components, OS, etc) simply eliminates the gain of having a better/faster CPU. Sometimes I end up using a 6 or 8 pin PIC with only a few lines of code to to solve complex problems where a (F)PGA/CPLD design would be a lot of work and a 16/32bit microcontroller simply overkill. As always, YMMV, best, Herbert >>> Are those some *very* arbitrary choices - you bet they are. >>> They are random picks, and were not optimized to show any >>> particular thing. Only to target an application that had some >>> serial i/o and a bit of A/D involvement. >>> Bottom line - not all PIC's are $1. once you start adding >>> peripherals. For $6 over in ARM land, you can get a lot of >>> chip. To be fair, my experience has been that you can do better >>> in the PIC24 line once you start adding stuff. Searching the >>> PIC24's is hard enough that my brief search tonight did not >>> show up a lower cost part. >> PIC24F04KA200 1 UART, 10 ADC, XLP, 1.38 USD (1.05 USD @1k) >> PIC24EP32GP202 2 UART, 6 ADC, 2.76 USD (1.86 USD @1k) > I knew they had to be there. Again suggesting that the PIC24's probably are a > better starting point these days. >> One (dis)advantage of the Microchip PICs is that there >> are so many different families and parts. > Indeed > Bob >> best, >> Herbert >>> Bob >>> On May 25, 2013, at 9:05 PM, Bob Camp <li...@rtty.us> wrote: >>>> Hi >>>> I just realized the "buy direct" button on that page requires a login. The >>>> single piece direct price is $9.70. First price break is at 25 pieces (to >>>> $8.95). >>>> Bob >>>> On May 25, 2013, at 8:56 PM, Bob Camp <li...@rtty.us> wrote: >>>>> Hi >>>>> It's one of the Freescale K60's they have them in several speeds and >>>>> packages. Others have similar parts. >>>>> http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=K60_120&nodeId=01624698C9DE2DDDAF&tab=Buy_Parametric_Tab&fromSearch=false >>>>> hopefully shows the family information >>>>> The first part on the list is the MK60FN1M0VLQ12 for 8% more money you >>>>> can get the 150 MHz core rather than the 120 MHz core version. Both have >>>>> enough pins that you can get at a lot of the peripherals at once. Both >>>>> have enough pins that they are not a lot of fun to solder by hand. Of >>>>> course their BGA cousins are even less hand solder friendly…. >>>>> Bob >>>>> On May 25, 2013, at 6:48 PM, Graham / KE9H <time...@austin.rr.com> wrote: >>>>>> On 5/25/2013 3:40 PM, Bob Camp wrote: >>>>>>> You can get a part with 1MB of flash, 128KB of ram, 6 UARTS, 4 16 bit >>>>>>> A/D's, 10/100 Ethernet, USB, and a bunch of other stuff for less than >>>>>>> $10. Drop this and that, go to half the flash, and yup, the price is >>>>>>> 1/2. Comes with a free toolchain and two very capable free versions of >>>>>>> RTOS. >>>>>> Bob: >>>>>> I was wondering which manufacturer/part you were referring to. >>>>>> Thanks, >>>>>> --- Graham >>>>>> == >>>>> _______________________________________________ >>>>> time-nuts mailing list -- time-nuts@febo.com >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.