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AX51 Macro Assembler

The Keil AX51 Macro Assembler is an enhanced 8051 assembler that provides support for 8051-based devices with additional instructions and features. The AX51 Assembler also adds numerous enhancements that are beneficial to large application development.

Following is a list of differenced between the AX51 Assembler and the A51 Assembler.

  • Support is included for the Dallas Contiguous Mode Instruction Set (390/5140/400).
  • Support is included for the Philips 51MX Instruction Set.
  • Case-sensitive symbols are supported.
  • Memory class support has been added.
  • Alignment features and relocation types have been added or enhanced.
  • 32-bit arithmetic for expression calculations is supported.
  • 8051 SFR's are no longer predefined.
  • More words are reserved for the assembler (ECALL for example).
  • OMF2 object module format is used.
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