Microcontrollers used in OEM systems

[Matt Sale]

> 
> 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.