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Hello everybody. I have a little doubt that I would like to ask you. I am trying to map a 64KB external SRAM memory in 16bit multiplexed bus mode in my XC164CS microcontroller. In keil compiler, at what adress should be mapped this memory? I have read the memory organization of XC164CS and I have seen that there are 3 zones to map a external memory. The problem is that I dont know in which zone should be placed. Thank you very much.
There are three but one of them is only 32k in size. Anywhere in the other two spaces should work fine. We have a design where we map 64k of FLASH memory at 40'0000H.
Hello Walter. I have already mapped my SRAM to 40'0000H with /CS0 and now the microcontroller is reseting constantly. Are you sure that SRAM is well mapped at that adress? Thanks for reply. ;-)
Hi John,
Sorry, I missed that you specifically asking about RAM but the type of memory should make no difference as long as the timing registers and such are configured properly for the device you are using. On our application that locates FLASH at 40'0000H using CS0 we also have external RAM at 60'0000H using CS1.
Could the watchdog timeouts be because you are using the external memory for program execution/variable storage? Maybe you can write a test program that executes entirely in internal memory but reads and writes to external memory allowing you to debug the problem.