Hi, I got a chip from WINBOND, w78c438c. It claims that it support 64kb program/1MB data memory space for applications which need additional external memory to store large amount of data . does that mean that my constant data (less than 1MB) can be access by functions in each bank? ( In my case, the constant data have about 300K, and 8 banks are used). I don't see that the chip will support FAR constant type.
为什么那么多的chinese like here :D? 好象您说的问题也是颇8简单~,一般是用编页的方式来选地址，我比较喜欢用philips p89c668,or p89c669.
i'm confuse now~,because i don't know what u means~ :C
does that mean that my constant data (less than 1MB) can be access by functions in each bank? The versions of the '51 that have "extended linear addressing" (and I assume that is the case for your chip) do not employ banking but a 24 bit addressing scheme. Erik
Take a look to the folder: C:\Keil\c51\Examples\FarMemory It contains several examples that help you to understand the configuration. For example: - 1MB Constants on Classic 8051 Basically you need to adopt just the L51_BANK.A51 file and enable ?B_VAR_BANKING. This allows you already to use the 'far' memory type with classic 8051 devices.