how to use 256 Bytes on-chip RAM of 89c51rd2bn

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Read-Only Author nafis jalal Posted 3-May-2005 11:56 GMT Toolset C51	how to use 256 Bytes on-chip RAM of 89c51rd2bn nafis jalal hello, i am using 89c51rd2BN from philips,i want to store 100 bytes of data as buffers,presently i am storing it in the RAM,however if the 128 byte RAM exceeds,what do i do,in datasheet of 89c51rd2 it says that 89c51rd2 has 256 Bytes on-chip RAM,and 768 Bytes on-chip XRAM,please let me know how do i use or access this memory. regards, nafis
Read-Only Author Jon Ward Posted 9-May-2005 13:00 GMT Toolset C51	RE: how to use 256 Bytes on-chip RAM of 89c51rd2bn Jon Ward To access the 128 bytes of on-chip data, define your variables with the DATA keyword. To access the 256 bytes of on-chip idata, define your variables with the IDATA keyword. To access the 768 bytes of on-chip xdata (xram), define your variables with the XDATA keyword. This is all in the manual. Refer to http://www.keil.com/support/man/docs/c51/c51_le_data.htm, http://www.keil.com/support/man/docs/c51/c51_le_idata.htm, http://www.keil.com/support/man/docs/c51/c51_le_xdata.htm Jon
Read-Only Author erik malund Posted 9-May-2005 13:40 GMT Toolset C51	RE: how to use 256 Bytes on-chip RAM of 89c51rd2bn erik malund do you REALLY believe that asking again will give you answers you like better? Erik
Read-Only Author Stefan Duncanson Posted 9-May-2005 15:31 GMT Toolset C51	RE: how to use 256 Bytes on-chip RAM of 89c51rd2bn Stefan Duncanson Look at the date and time of the post and compare it with the date and time of the other post.
Read-Only Author erik malund Posted 9-May-2005 15:40 GMT Toolset C51	RE: how to use 256 Bytes on-chip RAM of 89c51rd2bn erik malund Look at the date and time of the post and compare it with the date and time of the other post. they are 2 hours apart, why the above? Erik
Read-Only Author Stefan Duncanson Posted 9-May-2005 17:48 GMT Toolset C51	RE: how to use 256 Bytes on-chip RAM of 89c51rd2bn Stefan Duncanson "they are 2 hours apart, why the above?" I sometimes wonder whether you bother to read anything carefully. They are not 2 hours apart, they are 12 seconds apart. Obviously he pressed the 'Post' button twice by mistake.
Read-Only Author erik malund Posted 9-May-2005 18:09 GMT Toolset C51	RE: how to use 256 Bytes on-chip RAM of 89c51rd2bn erik malund oops, I looked at "last post" In another forum that column is "original post". I am sorry, we all have accidentially double clicked. Erik

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