need microcontroller for design

R

robz

New Member
I am working on a project, and made a design for a generator that has been build up with some external memory etc.

the design needs a microcontroller with the follow features:
- external adress data bus (programmable) with multiple chip enables lines
- usart (rs232 connection)
- several programmable i/o ports
- flash memory (normal range amount)
- maybe it's handy to have some pwm outputs...

a msp430 doens't have a externet adress data bus with chip enable lines.
maybe i was thinking about a atmel but i'm not sure.

please help me out...
 
Have a look at Freescale's MCUs. Very nice chips to program. Architecturally they're very similar to the old 6809/68000 Motorola microprocessors.

A BDM Pod is a must for easy programming and on-chip debugging.

Look at the 912 or 9S12 series. The HC11 is quite obsolete, and 812 pretty much as well.

Technological Arts in Toronto has a good line of dev boards.

EVBplus.com has a good line of dev boards too. In particular, the Dragon12-Plus is very nice.
 
I can only find PIC microcontroller with 1 chip select (chip enable) line
because I communicate with multiple chips, i need more of them..

by PIC microcontrollers the module is called : parallel slave port
 
Any output pin can act as a CS line. Maybe if you explain what you are trying to do then people will be better able to advise.

Mike.
 
thank you for the information.

what the purpose is: i'll read-in data from the rs232 (usart), put it in external flash memory, after that, i can select with a user interface which part of the programmed flash memory must be put on the data bus, set it into a RAM and do some tests with it.

i'll found the pic18f87j11 microcontroller, it got a external memory bus and the features named above, i'll think i'am going to use that one for my design.

someone got some experience with this type of microcontroller ? every information is welcome ofcourse
 
The PIC18F87J11 is only available in a TQFP package, not the easiest thing to solder and is also a 3.3V device. The old 17C PICs had external RAM support in microcomputer mode. Are you trying to connect it to another computers bus? If so is it a 3.3V bus?
 
Soldering the TQFP is no problem. Page 103 of the datasheet shows a 16-BIT BYTE SELECT MODE EXAMPLE, so also the 3.3V device is no problem.

what do you mean with another computers bus? the device will be coupled to a FLASH memory and SRAM.. and to a rs232 with a max3232 level converter (so that you can power the device with 3.3V).
 

Your still not stating what your intended use is. You could get a 28 pin pic, a X meg serial EEPROM and a keypad and implement what you described above.

Mike.
 
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