hpoppe@ncar.ucar.edu (Herb Poppe) (02/06/91)
I'm in the market for small quantities of a moderately priced single chip microcontroller with an async serial port and modest onboard program EEPROM. The selection of Motorola MCUs in the latest Active catalog caught my eye but my Motorola library is dated and I don't know how these chips differ. I would appreciate if someone could point out the differences among the following devices: MC68HC11A0FN MC68HC11A1FN MC68HCP11A1FN MC68HC11E1FN MC68HC11A0P MC68HC11A1P MC68HCP11A1P What is the maximum frequency crystal that can be used with these MCUs. I recall some comments here that some devices in the 68HC11 series cannot (or can with great difficulty) be programmed/run with only the internal EEPROM. I would appreciate hearing more detailed comments along these lines. These devices are priced between $10.90 and $34.50. Can you recommend other devices in this price range that sport async serial I/O and modest onboard program EEPROM that are readily available? The Active catalog also mentions the MC68HC705C8FN MC68HC705C8P Are these really OTP EPROM devices, or are they windowed? Herb Poppe hpoppe@ncar.ucar.edu NCAR (303) 497-1296 1850 Table Mesa Dr. Boulder, CO 80307-3000
djw@hpldsla.sid.hp.com (David Williams) (02/07/91)
> I would appreciate if someone could point out the differences among the > following devices: > > MC68HC11A0FN > MC68HC11A0P All 68HC11 features, this configuration is: 256 bytes static RAM no EEPROM MC68HC11A0FN: 52 pin quad MC68HC11A0P: 48 pin DIP (only 4 A/D inputs) > MC68HC11A1FN > MC68HC11A1P 256 bytes static RAM 512 bytes EEPROM MC68HC11A1FN: 52 pin quad MC68HC11A1P: 48 pin DIP (only 4 A/D inputs) > MC68HCP11A1FN > MC68HCP11A1P ?? sounds like a mistake, I'm pretty sure the naming is: 68HCx11pp where x is the chip type, and pp is the package: x blank basic 68HC11 with or without mask ROM 7 OTPROM 8 EEPROM pp P DIP package FN quad pakage I don't have my 68HC11 family book here to be sure. > MC68HC11E1FN 512 bytes of EEPROM 512 bytes of static RAM > What is the maximum frequency crystal that can be used with these MCUs. up to 2 Meg bus clock == 8 meg Xtal > I recall some comments here that some devices in the 68HC11 series cannot > (or can with great difficulty) be programmed/run with only the internal > EEPROM. I would appreciate hearing more detailed comments along these > lines. There has been a number of discussions about the HC11's lack of an elegant power down reset (or something). Motorola has an application note out about how to add stuff to detect low power, and reset. Compared to the HC05, the HC11's whole power_up_down/reset stuff is a bit lacking. The HC05 claims (though I haven't tried one yet - this weekend :-) that it has all the good stuff on chip, and is self contained with need of just the crystal and power to run. The data books for the HC11 (and I'm not smart enough to deviate from what they say) suggest a Motorola MC34064, or Seiko S8054HN low voltage inhibit circuit to properly handle the low power reset situation. These are really hard to find! Does Active have them? Again, the book suggests an alternative circuit of 14(!) parts. > These devices are priced between $10.90 and $34.50. Can you recommend > other devices in this price range that sport async serial I/O and modest > onboard program EEPROM that are readily available? > > The Active catalog also mentions the > > MC68HC705C8FN > MC68HC705C8P > Are these really OTP EPROM devices, or are they windowed? MC68HC705C8FN: 44 pin quad OTPROM MC68HC705C8P: 40 pin DIP OTPROM MC68HC705C8S: Ceramic 40 pin DIP (I think) EPROM These guys, like the HC11s can program themselves. It's all in the data book. Hope that helps - I wondered why I brought my Motorola data book to work today :-) David Williams ___________________________________________________________________ Hewlett-Packard Scientific Instruments Division (SID) /\___________ 1601 California Ave, Palo Alto, CA, USA. /\______________/\________ phone: 415 857 6100. FAX: 415 852 8011 //\\____________|__________ HP-UX Mail: djw@hpldsla.hp.com / \____/\____/\___________ HPdesk: (djw)hpldsla/HP1900/00 /\____________/ \__________
mmm@cup.portal.com (Mark Robert Thorson) (02/07/91)
68HC11A0 -- 256 bytes RAM 68HC11A1 -- 512 EEPROM, 256 RAM 68HC11A8 -- 8K ROM, 512 EEPROM, 256 RAM 68HC11D3 -- 4K ROM, 192 RAM 68HC711D3 -- 4K EPROM, 192 RAM 68HC11E0 -- 512 RAM 68HC11E1 -- 512 EEPROM, 512 RAM 68HC811E2 -- 2K EEPROM, 256 RAM 68HC11E9 -- 12K ROM, 512 EEPROM, 512 RAM 68HC711E9 -- 12K EPROM, 512 EEPROM, 512 RAM 68HC11F1 -- 512 EEPROM, 1K RAM 68HC11K4 -- 24K ROM, 640 EEPROM, 768 RAM 68HC711K4 -- 24K EPROM, 640 EEPROM, 768 RAM the 68HC11A2 and 68HC811A8 have been dropped I believe FN means DIP and P means PLCC, but I'm not sure because my book doesn't say. the windowed parts (i.e. UV-erasable) are very expensive, I believe they run about $125 each hope this helps. other families you might want to look at are the NEC K3 family and the Texas Instruments TMS370 and the 8051 (originally produced by Intel, but now widely second-sourced)
mmm@cup.portal.com (Mark Robert Thorson) (02/07/91)
on re-reading your posting, I see you want EEPROM program memory. I guess that means you're stuck with the 68HC11. (The TI TMS370 has EEPROM _data_ memory.) One alternative is to put a boot-loader in EPROM, and upload from a serial EEPROM. You can talk to the EEPROM through either a couple of parallel port pins or using the synchronous serial I/O port. Typical serial EEPROM's hold up to 2K bits and cost about $1 (in quantity, samples are usually free).
hbg6@citek.mcdphx.mot.com (02/08/91)
>I would appreciate if someone could point out the differences among the >following devices: > >MC68HC11A0FN >MC68HC11A1FN >MC68HCP11A1FN >MC68HC11E1FN >MC68HC11A0P >MC68HC11A1P >MC68HCP11A1P > Here's what the part numbers mean on the Motorola HC11 family of processor chips as per my reference manual: MC68HCx11xx MC = MC - Fully Qualified Device XC - Tested Production M - General Family Reference 68HC = Motorola HCMOS Family x = 7 - EPROM program memory 8 - EEPROM program memory none - ROM or no program memory 11 = MC68HC11 Family xx = Specific part type PART TYPES: EPROM ROM EEPROM RAM 11A8 8K 512 256 basic device for whole family 11A1 512 256 same as A8 with ROM disabled 11A0 256 same as A1 with EEPROM disabled 811A2 2K 256 811A8 8K+512 256 11E9 12K 512 512 11E1 512 512 E9 with ROM disabled 11E0 512 E1 with EEPROM disabled 811E2 2K 256 711E9 12K 512 512 11D3 4K 192 low cost 40 pin 711D3 4K 192 low cost programmable (once) 11F1 512 1K high performance There are other differences in functionality between the various part numbers but they're a bit complex to type out. I.E.; There are four LESS A/D channels on the 11A8 if you buy the 48 pin DIP as opposed to the 52 pin PLCC ( smt ) package. Find a copy of the Motorola HC11 Reference Manual ( Motorola document number M68HC11RM/AD ). BTW, Wondering why you would want to disable the ROM or EEPROM? How 'bout cause it dosen't work. later, John ..................................................................... reply to 'from' address; hbg6@citek.mcdphx.mot.com NOT the 'sender' line address! Someday my sysadm will decide this is a 'real' problem. :-) ..................................................................... All opinions expressed are mine and not Motorolas, their loss. .....................................................................
esupg@warwick.ac.uk (barj) (02/12/91)
My Motorola DataBook list MC69HC704P4. However, the information it gives is
only a preview. Is this device now in production ? Does anyone have a
pinout or any performance figures ? How much is the device (approx.) in small
quantities ?
Any information gratefully received.
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