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From: ftpam1@acad3.alaska.edu (MUNTS PHILLIP A)
Newsgroups: sci.electronics
Subject: Re: information wanted: microcontrollers with slave bus interfaces
Message-ID: <1991Mar12.010607.3448@ims.alaska.edu>
Date: 12 Mar 91 01:06:07 GMT
References: <1991Mar11.194442.10117@batcomputer.tn.cornell.edu>
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In article <1991Mar11.194442.10117@batcomputer.tn.cornell.edu>, newman@theory.tn.cornell.edu (Bill Newman) writes...
>I am interested in pointers to microcontrollers which have registers, ports,
>and handshake lines built in to allow them to serve as passive devices on
>another bus, in the same way as your typical UART, PIO, or what have you.
>I am particularly interested in microcontrollers with internal program RAM
>which can be set by the bus master on system startup.
>I once read a data sheet for one of Intel's microcontrollers (UPI?)
>which was designed to be accessed from an 80xx family bus, 
>and to serve e.g. as a keyboard controller, but the version that I saw 
>was ROM programmed.  So far I don't know of any such devices
>whose program RAM can be set by the bus master on startup.
> 
>Please e-mail responses; if I get useful feedback, I'll summarize.
> 
>  Thanks,
>    Bill Newman
>    newman@theory.tn.cornell.edu

There are quite a few micros that have a slave port for passing data.
These include the 8041 and 8042 from Intel (based on 8048), the 80452 from
Intel (based on 8051; real elaborate slave interface including FIFO buffers
and DMA), the 80451 from Signetics and others based on 6502 and Z8 cores.

The only device I remember that allows the host to load program memory on
the micro was a variation of the Z8 from Zilog that had a socket for plugging
in a 6116 static RAM or 2716 EPROM.  If you opted for the RAM, there was
a procedure for writing to it.  A nonvolatile SRAM like SGS or Dallas
Semiconductor make ought to work pretty slick in a system like that.

My Zilog data book is about 2500 miles southeast of here so I can't look up
the part number for you.

Philip Munts N7AHL
NRA Extremist, etc.
University of Alaska, Fairbanks