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Limitations

Keil development development tools without a current product license run as a Lite/Evaluation edition and have the following restrictions:

MDK-ARM Lite Edition
  • Programs that generate more than 32 Kbytes of code and data will not compile, assemble, or link.
  • The debugger supports programs that are 32 Kbytes or smaller.
  • The compiler does not generate a disassembly listing of the machine code generated. The -S, --asm, and --interleave compiler command-line options are disabled. Projects will not compile with Target -> Listing -> C Compiler Listing enabled.
  • The compiler and assembler do not generate position-independent code or data. The --apcs /ropi /rwpi /pic/ pid compiler and assembler command line options are disabled.
  • The assembler and linker create Symbolic Output Format objects which cannot be linked with third-party linker utilities. Fully licensed tools generate standard ELF/DWARF files which may be used with third-party utilities.
C51 Evaluation Tools
  • The 8051 compiler, assembler, linker, and debugger are limited to 2 Kbytes of object code. Source code may be of any size.
  • Programs that generate more than 2 Kbytes of object code will not compile, assemble, or link.
  • The debugger supports programs that are 2 Kbytes or smaller.
  • The startup code generated includes LJMPs. Code generated cannot be used in single-chip devices that support 2 Kbytes or less of program space.
  • Programs start at offset 0x0800. Programs generated with the evaluation software may not be programmed into single-chip devices with less than 2 Kbytes of on-chip ROM.
  • No hardware support for multiple DPTR registers is provided.
  • No support for floating-point arithmetic and no support for user libraries is provided.
  • No support for in-line assembly using #pragma ASM.
  • The following components which are present in the PK51 Full Version are not included in the Evaluation Version: Linker for Code Banking and RTX51 Tiny Real-time Operating System.
C251 Evaluation Tools
  • The 251 compiler, assembler, linker, and debugger are limited to 2 Kbytes of object code. Source code may be of any size.
  • Programs that generate more than 2 Kbytes of object code will not compile, assemble, or link.
  • The debugger supports programs that are 2 Kbytes or smaller.
C166 Evaluation Tools
  • The C166 compiler, assembler, and linker are limited to 4 Kbytes of object code. Source code may be of any size.
  • Programs that generate more than 4 Kbytes of object code will not compile, assemble, or link.
  • The debugger supports programs that are 8 Kbytes or smaller.
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