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Jun Wei Posted
13-Aug-2004 04:21 GMT Toolset
None |  how to use external program/data memory address up to 64k/1M? Jun Wei 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. | | Read-Only Author
haha @ Posted
13-Aug-2004 04:41 GMT Toolset
None | RE: how to use external program/data memory address up to 64k/1M? haha @ 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. | | Read-Only Author
haha @ Posted
13-Aug-2004 04:49 GMT Toolset
None | RE: how to use external program/data memory address up to 64k/1M? haha @ i'm confuse now~,because i don't know what u means~ :C | | Read-Only Author
erik malund Posted
13-Aug-2004 13:25 GMT Toolset
None | RE: how to use external program/data memory address up to 64k/1M? erik malund 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 | | Read-Only Author
Keil Support, Intl. Posted
31-Aug-2004 14:38 GMT Toolset
None | RE: how to use external program/data memory address up to 64k/1M? Keil Support, Intl. 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. | | Read-Only Author
Keil Support, Intl. Posted
31-Aug-2004 14:38 GMT Toolset
None | RE: how to use external program/data memory address up to 64k/1M? Keil Support, Intl. 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. | |
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