This in the news:
"Microchip sues Zilog over 8-pin microcontrollers"
and it's not April 1st ?
Microchip used to be an engineering focused company, who took a small Micrcontroller core, and used it very well.
Now, it seems Zilog must be taking a chunk of their pie, and they cannot compete on technical merit alone ?
So, let's glance at what innovation they claim to have ?
6,696,316 Filed: November 18, 2002 Integrated circuit (IC) package with a microcontroller having an n-bit bus and up to n-pins coupled to the microcontroller "By using pins with multiple functions, the instant invention permits an n-bit architecture microcontroller to use less than or equal to n pins." 6,483,183 Granted November 19, 2002 Integrated circuit (IC) package with a microcontroller having an n-bit bus and up to n-pins coupled to the microcontroller "By using pins with multiple functions, the instant invention permits an n-bit architecture microcontroller to use less than or equal to n pins."5,847,450 Granted December 8, 1998 Microcontroller having an n-bit data bus width with less than n I/O pins "2. Description of the Related Art
"Microcontrollers are widely known and used in many different applications. A typical architecture used in microcontrollers today is the 8-bit architecture (i.e. the data bus width of the microcontroller is 8 bits wide)."
" One problem with this and other sizes of microcontrollers is that to support an n-bit architecture, greater than n pins are required to be connected to the microcontroller."
ROTFL, What nonsense!. Microcontrollers are typified by having ON CHIP memory, and have _never_ had any bus-related pin-connection limit!
Why should the BUS width have ANY relation to the pin count in a Microcontroller ? - that's as sensible as claiming invention for a car that has fewer (or more?) wheels than cylinders ?!
Even the Intel 4004 used multi function pins, so prior art there goes back a very long way indeed.
Large volumes of ROM based microcontrollers will have been shipped over the years, quite happily operating with less connected pins than the bus width.
The ancient 8-bit 8048 used 4 pins with the 8243 IO expander...
Prediction: This silliness will make Microhip a laughing stock in the engineering area, and probably not make their stock holders too happy either.
They are going to have to sue Atmel, Fairchild, Philips ( and others ) as well..... this will be amusing to follow. [What _was_ Steve thinking?]
-jg