memory mapped i/o beyond ram area

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Read-Only Author Erwin Pantuca Posted 30-Jul-2002 11:26 GMT Toolset C51	memory mapped i/o beyond ram area Erwin Pantuca I have an application using 32K RAM (external), with memory mapped I/O beyond this area (from 8000). I have not tried it yet, but is it correct to set the ram size to 32K? Would the linker complain that the variable used for memmap i/o is beyond the preset ram size?
Read-Only Author Gary Partis Posted 30-Jul-2002 13:18 GMT Toolset C51	RE: memory mapped i/o beyond ram area Gary Partis I simply say that I have 64KBytes of memory and have a large 32KByte byte array from 0x8000 to 0xffff and use the _at_ statement to fix it to that location. Then use something like : io[IO_RTC]=0x55; where io is the array, and IO_RTC is a memory mapped location offset within that array. Hope that helps, Gary Partis
Read-Only Author Alan Chen Posted 30-Jul-2002 14:36 GMT Toolset C51	RE: memory mapped i/o beyond ram area Alan Chen Hope this may help you a bit. http://www.keil.com/support/docs/2107.htm

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