68HC11 Learning tools

[Darrell Norquay]

At 04:34 PM 1/19/97 -0500, Frederic Breitwieser wrote:

>Its a solid processor, and you are right, being able to disable the internal
>rom/ram and use external components make programming a helluva lot easier.

Recently I've been using the HC11E2 a lot.  It makes things so much easier.
Basically, it's an 'E9 core with 2K EEPROM instead of EPROM, you simply
download code through the serial port using a freeware program.  About 60
seconds to erase and program the whole 2K, and only requires a serial port.
If 2K is not enough codespace, there is a new device (can't remember the
mfg. offhand, I can look it up) which has an 8K EEPROM along with 16 port
bits, allows you to run the chip in exp. mux. mode but still retain the port
bits as if it was in single chip mode.  Another flavor allows external RAM
and EPROM (or E^2) while still emulating single chip mode.

>Also, to anyone who is going to be writing a lot of code, and changing it
>often for testing, Dallas Semiconductor makes a 27256 compatible STATIC RAM
>chip, typically used for EISA PC's to store their EISA configuration, but 

Another great product is Dallas's Smart Socket.  It provides battery backup
for any low power CMOS RAM just by plugging it into the socket.  Also
contains a write protect function which will not allow writes to the chip if
voltage is out of spec.  This product is great since it can be added to any
existing RAM without board modifications.  They have models for 2K through
1M RAM chips.



regards
dn
dnorquay at iul-ccs.com