Microcontrollers used in OEM systems

[swagaero]

Matt Sale wrote:
> 
> >
> > On this note, anybody ever figured out what some of the registers in
> > the HC11 at $1040 and above are used for? How about those regs at,
> > say, $1001 or $1006 etc that are mysteriously labelled "reserved"
> > in the data sheets. Are these register locations left to the
> > discretion of the Delcos and the NDs of the world to do as they
> > please or is there a universal functionality associated with them?
> >
> >
> Depends on the hc11 derivative.  Each derivative has its own
> memory map (A8, F1, K4, E9, ...).  "Reserved" generally means
> unimplemented.  If you try to read one,
> you might get $FF, or you might get an address back, depending
> on the addressing mode & what was last driven on the internal
> data bus.
> 
> And yes, there are application specific hc11 derivatives that
> are not available on the general market.
> 
> --
> Matthew D. Sale,  IC Development Engineer, Delco Electronics Corp.
> msale at iquest.net   http://www.iquest.net/~msale
> '69 Mustang 351W 5-spd (13.464 at 103MPH using cave-man technology).
> 
> All responses are my own and should not be mistaken
> for those of Delco Electronics or General Motors.


99% of the reserved addresses are not connected to anything I know I
have chased a lot of them I wish Motorola would be so kind as to let us
hackers have a road map??