I have a question about interfacing f340 with external XRAM. I couldn't find how how to configure the IOs while connecting a uC with EPROM. I mean to say, which IO pin to connect with which flash pin .

I am using the flash (M29W320ET).

http://www.datasheetcatalog.org/datasheet2/7/0trulfzexhj3y9uearzeed0u69fy.pdf

Please refer me to some document which explains the connection of pins.

The SILabs chips are (for obvious reasons) incapable of operating from external CODE memory. Using EPROM as external DATA memory makes no obvious sense. Please clarify.
Also when giving links to datasheets link to the MANUFACTURERs site not some datasheet collection site where looging on is guaranteeing you a bucketful of spam.

Erik

Please refer me to some document which explains the connection of pins.
Usually the datasheets of the parts which should be connected together

I mean to say, which IO pin to connect with which flash pin .
Since the 8051 is a 8-bit MCU, and the 16-bit Flash you've chosen can be driven in a 8-bit mode, I'd connect it as follows (seen from flash):
- D7-D0 to the databus
- #OutputEnable to #ReadStrobe
- #WriteEnable to #WriteStrobe
- DQ15A–1 to A0 of address bus
- A14-A0 to A15-A1 of address bus(one bit shift!)
- A20-A15 to GPIO
- #ChipEnable to GPIO
- #Byte to GND

Regards,

@Erkim
I need to store and read data in mbs, which is not possible with internal RAM of f340. XRAM is not for code purposes just a data storage.

@Scotty

Actually i need to know the DATABUS & ADDRESS BUS pins on the uC.

" - D7-D0 to the databus "
what pins on uC are DATABUS

" - DQ15A–1 to A0 of address bus "
what is address bus on f340

Re external memory:
it all dpends on how many port pins you need for other things, you can go multiplexed (19 pins for memory) or non-multiplexed (26 pins for mrmoy interface)

You need to set up the crossbar correctly, see if config will do it for you.

BUT: no definite answer can be given till you decide on (non-)multiplexed.

Non multiplexed mode-
A8-15 on P2
A0-7 on P3
D0-7 on P4
/WR on P1.7
/RD on P1.6

Multiplexed
AD0-7 on P4
A8-15 on P3
ALE on P1.3
/RD, /WR as non-multiplexed.

" OK, you are ware that you can not "just write" to flash, you need to erase the associated page first "

Erikm:" OK, you are ware that you can not "just write" to flash, you need to erase the associated page first "
hafblud:I think first i needed to know where to connect the flash, thats why i only asked for the details of data & address pins of uC.
What Erik wants to say is that you only can write single bytes if the corresponding flash page has been erased. If a byte has a value other than 0xFF and the byte must be rewritten then the complete page containing the byte must be erased prior to re-programming.

Regards,

Do we have to skip (PxSKIP) the pins that are dedicated for Memory or writing to Flash Operations (P1.3, P1.6, P1.7, P2, P3, P4) ?