NEC D75008 MCU

[maurice smulders]

I think I have the NEC databook containing the series. Do you need a scan?

Thanks,

Maurice


On Mon, Sep 6, 2010 at 5:13 PM, allison <ajp166 at verizon.net> wrote:
> On 09/06/2010 02:34 PM, Brent Hilpert wrote:
>>
>> On 2010 Sep 6, at 5:56 AM, allison wrote:
>>
>>> On 09/05/2010 10:06 PM, Brent Hilpert wrote:
>>>>
>>>> I just ran across an NEC D75008 microcontroller in a small photo copier
>>>> ca. 1990. According to a search it is a 4-bit microcontroller.
>>>>
>>>> Idle curiousity, but does anybody know if this has any inheritance from
>>>> or relation to better-known microcontrollers such as the TMS1000, that is,
>>>> is it NEC's version of something better known?, or is it NEC's own
>>>> architecture?
>>
>>> No,  it is NEC unique.  For 4 bitters that is usually the case.   it is a
>>> much more expanded
>>> design closer to modern PICs with many variants having LCD driver on
>>> board.
>>
>> OK, a family I had never run across before. Found a datasheet for (by
>> appearance) a descendant (D75112/6). Looks like they took a cue from the
>> 8080 family - the register set is nearly identical but in 4 bits, with
>> register pairs BC, DE, HL to make 8-bit registers.
>>
>
> Many of the 4bit MCUs did that.  The instruction set is is similar to 8080
> and different since it has
> skip on condition and typical Harvard oddities and additions for tables and
> inline constants.
>
> The family closest to it is the 1980s ucom75.
>
> Allison
>



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