8-bit µC with external memory bus

[cyberblak]

16x16 multiplier

Hi,

I need to find an 8-bit microcontroller that has an external bus with a lot of addressable space.

I need several Mb of RAM and FLASH memory.

Any ideas?

cyberblak

 

[CMOS]

microcontroller external memory bus

You can go for ARM Microcontrollers especially LPC2200 series from Philips. Theses have address space of 4MB!!

 

[cyberblak]

external memory 8051

Hi,

Thanks for the reply. I think that ARM processors are 16-bit/32-bit though... Am I wrong?

Thanks,

cyberblak

 

[CMOS]

dallas and pic and external memory

Yes you are right.

I dont think any other 8-bit uC supports memory in MBs. However you can use Banking technique in 8051 uCs to go upto 1MB. Keil Supports this kind of technique, but I dont think its a very effecient way.

Why do you need so much memory? Is it necessary to have parallel bus memory only? Can't you use Compact Flash or Memory Sticks?

 

[budhy]

ram parallel bus maxim dallas

Maxim-Dallas's DS80C400 Network Microcontroller
**broken link removed**
with
#High-Performance Architecture
Single 8051 Instruction Cycle in 54ns
DC to 75MHz Clock Rate
Flat 16MB Address Space
Four Data Pointers with Auto-Increment/Decrement and Select-Accelerate Data Movement 16/32-Bit Math Accelerator

and much more

Added after 18 minutes:

8051 Drop-In Microcontrollers
Dallas Semiconductor's 8051-drop-in microcontrollers have the same code and are pin compatible with older 8051 devices, but deliver up to 33 times the performance.

Key Features

* Compatible with 8051 Pins and Instruction Set
* Flash, EPROM, and ROM Memory Options
* 1kB SRAM
* Up to Four 16-bit Counters
* 256 Bytes of Scratchpad RAM
* Up to 16MB Addressable Memory for Code or Data
* Up to Three USARTs
* Optional 16 x 16 Hardware Multiplier
* Power-Up/-Down Reset
* Early Warning Power-Fail Interrupt

**broken link removed**

 

[SuperUser]

8bit bus ram

Some Renesas H8/300H microcontrollers are ROM-less and you can use external flash chip for the program memory and also an external RAM.
**broken link removed**

 

[lambtron]

analog device 16mb external data memory

Why must it be an 8 bit processor? Is it because you want an 8-bit external data path?

 

[IanP]

external memory bus

One other option is the Intel 8088 microprocessor ..
It is an old gismo but still can be found here and there ..

The Intel 8088 is an Intel microprocessor based on the 8086, with 16-bit registers and an 8-bit external data bus. It can address up to 1 MiB of memory.

https://en.wikipedia.org/wiki/Intel_8088

Regards,
IanP

 

[wjr1955]

external memory bus

Hi,

Aduc831 series (8051 core) from Analog Devices

16Mbytes external data memory space.

 

[ql000]

8bit external memory

Hi!

I am using pic 18F8722. It supports up to 2MB of external RAM.