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'[OT]: Some stupid questions for HC11 users'
2001\04\16@185529 by Thomas N

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Hi everyone,

I hope some of you out there familiar with the HC11 Microcontroller.  I just
have some quick [and stupid] questions.

1.  How much user's programming memory does the HC11 have?  Do I need to
switch to different program "page" like the PIC?

2.  How much RAM does it has?

3.  I am using the HC11 EVBU board.  When I download the program from the PC
to the HC11 board, does the program go to the EEPROM or where?

4.  Why do I need BUFFALO when my program can run by itself (I think...)?
If I take BUFFALO program out, should I get more programming space?

5.  Why do you choose the PICmicro over the HC11 or HC12 MCU.  I believe the
HC11 has more powerful instructions.

Thank you!
Thomas


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2001\04\16@190655 by Thomas N

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Just found out that the 68HC711E9 has only 512 bytes of EEPROM and 512 bytes
of RAM.  How come the so powerful MCU has little EEPROM?  It is even less
than the PIC16F84 which has 1K of Flash.

The EEPROM is where I store my program, right?  I don't think I can write to
the ROM or EPROM on the HC11EVBU board.

Thomas


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2001\04\16@193320 by Bill Westfield

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   I hope some of you out there familiar with the HC11
   Microcontroller.  I just have some quick [and stupid] questions.

Somewhat slightly acquainted.


   1.  How much user's programming memory does the HC11 have?  Do I
   need to switch to different program "page" like the PIC?

It varies widely depending on the exact version of 68hc11 (and there are
LOTS of versions.  I believe that the 68hc11 has a single linear address
space that hold code, data, AND "special function registers" (ie ioports,
timers, and so on.)


   2.  How much RAM does it has?

Ditto.  128 to 512 bytes or so.


   3.  I am using the HC11 EVBU board.  When I download the program
   from the PC to the HC11 board, does the program go to the EEPROM
   or where?

Don't know.  Since it's got the single address space, you can at least
theoretically put your program in EPROM, EEPROM, or RAM.  (The TI MSP430
does this as well.)


   4.  Why do I need BUFFALO when my program can run by itself (I think...)?
   If I take BUFFALO program out, should I get more programming space?

Maybe.  But then you may need a real programmer instead of just an EVBoard?
There's a fair set of "experiment" boards that put some sort of "operating
system and program library" in (OTP or MASKED) ROM, and then allow smallish
programs to be (quickly, easilly, and erasably) downloaded to RAM or EEPROM
for each "experiment."


   5.  Why do you choose the PICmicro over the HC11 or HC12 MCU.  I
   believe the HC11 has more powerful instructions.

Instruction set isn't everything.  I don't think that there are any small,
cheap, readilly available 68hc11s by the standards used in the PIC
community.  Motarola has a bad reputation for chip availability, especially
in small quantities.


   Just found out that the 68HC711E9 has only 512 bytes of EEPROM
   and 512 bytes of RAM.  How come the so powerful MCU has little
   EEPROM?  It is even less than the PIC16F84 which has 1K of Flash.

Cause it also has some large amount of ROM/OTPROM (the E9 may or may not be
a version where that ROM is not present, or is bad.  Also, you can add
additional external memory.  There's a fairly large market for obsolete or
misprogrammed ROM micros that have executable EEPROM or external memory
capabilities (usually via some sort of "internal ROM disable" pin.)
Somebody else's mistake becomes the experimentor's source of cheap parts.
Even 512 bytes of program isn't too bad, especially for a micro with a
good instruction set like the 6811.


   The EEPROM is where I store my program, right?  I don't think I
   can write to the ROM or EPROM on the HC11EVBU board.

See above.  RTFM.

IIRC, most of the motarola micros can program their own PROM via serial
download, using some internal rom code that is normally not present in
the address space (another magic pin state.)  This sorta begs the question
as to why there aren't more "universal motarola" programmers...

BillW

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2001\04\16@194003 by Thomas N

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Thank you for the information.  It clears up my mind alot!
Thomas

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