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In article <1992Sep9.155129.12557@ncar.ucar.edu> Herb Poppe aksk :


>> I don't use the 68HC05 but I do work with the ST62T15.

>Who makes this device?
>Is its instruction set patterned on some other well-known device?
>How many pins does it have.
>Peripherals? (Timers, A/D, D/A etc.)
>Other family members; devices with EEPROM?...

and here are the answers :

The ST6 family is a product of SGS-THOMSON (ST), it consists of a number
of device families ST61 ST62 ST63, etc. I only use the ST62 family. The
instruction set is (as far as I know) NOT compatible with MCUs from
another vendor... Within the ST62 family there are four main members :

ST6210 : 2K ROM / 12 I/O
ST6215 : 2K ROM / 20 I/O
ST6220 : 4K ROM / 12 I/O
ST6225 : 4K ROM / 20 I/O

The 12 I/O versions come in a 20 DIP package, the 20 I/O versions in an
28 DIP. I use also a 20 SO-package. For all versions there are EPROM
versions (ST62EXX) and One time Programmable versions (ST62TXX). It has
the following peripherals on-chip : 8 bit timer with 7 bit prescaler,
All I/O pins programmable in one of 5 modes (pullup/ no pullup,
interrupt, edge/level triggered, CMOS out, Open drain out, Analog in), 8
bit A/D convertor (70 us), Watchdog Timer, 64 bytes RAM.

The MCU is however, not fast.... 8 MHz Xtal max, divided internally by
13, and four of these cycles per instruction (for most instructions..
some are faster), results in 6.5 usec instruction cycle... However in
terms of memory usage, the code is quite efficient : the most frequently
used instructions are only 1 byte.

You can start developing with this little machine by buying the ST6
Starter Kit. It includes four samples of ST62E10 and ST62E15, a
programmer that fits into your PC's printerport, a MacroAssembler, and a
Software Simulator (MS DOS) + all databooks related to this material.
The kit is quite cheap (7500 Bfr = $250) and the OTP processers cost
about $8. However I think that in the USA this can be less because most
hardware costs in Europe two times the price they charge in the USA.
(can someone explain this ??) An emulator exists for it (and it would be
usefull since the simulator doesn's simulate the timer and the A/D
convertor), I don't know what it costs.


SGS-THOMSON has other (more performant) families like the ST9 that are
direct competitors with Motorola's HC11 and others...

So far my answers..  Now my question : Some weeks ago I asked if anyone
has source for this device, (or utilities like a compiler or so) but I
got no answers yet. I hope at least someone in the world has done some
projects with it !

Regards & Succes,

Pascal Roobrouck,
       
   ~~..~~
     `'