Lpc2000

--- In lpc2000@yahoogroups.com, Herbert Demmel <dh2@d...> wrote:
>
> Hi,
> 
> thank you for your valuable input, but (as already mentioned in an 
earlier 
> email) I forgot to tell, that I need an external data bus as well.
> 
> To summarize the requirements:
> 
> ARM7 with JTAG
> Flash >= 128k (better 256k)
> RAM >= 32k
> USB (should be 2.0)
> 2 x serial ports, 2 x SPI, 2 x I2C, 1 x ADC (>= 10 bit), PWM
> 
What do you need the external data bus for?  I (and many others) 
have simulated an external data bus by just bit-banging the GPIO 
ports.  You don't get the same performance, but you can still get it 
quite fast for most intents and purposes.  This is particularly 
useful on the LPC213x or LPC214x because of the inexpensive 
processor.  I, for example, have an external 2MB sram chip hooked up 
to GPIO ports.  You can also use serial flash, for example the 
M25P40.