What's New in C51

The following sections list the changes instituted in each release of the C51 toolset.

C51 Version 7.07 Release

• [uVision2 IDE]
  Added a new dialog for project component management under Project - Components, Environment and Books. This dialog allows you to change the order of project targets and file groups.
• [uVision2 Debugger/Simulator]
  Added simulation for the following devices:
  • Atmel AT89C5131 (except USB)
  • Atmel AT89C5132 (except A/D Converter, USB, Audio Interface, MMC Controller, and IDE/ATAPI Interface)
  • Cygnal C8051F300
  • Cygnal C8051F301
  • Cygnal C8051F302
  • Cygnal C8051F303
  • Cygnal C8051F304
  • Cygnal C8051F305
  • Cygnal C8051F310
  • Cygnal C8051F311
  • Cygnal C8051F320
  • Cygnal C8051F321
  • Cygnal C8051F330
  • Cygnal C8051F331
  • TI MSC1210 (IC Simulation)
  • TI MSC1211
  • TI MSC1212
• [uVision2 Debugger/Simulator]
  Corrected the following simulation problems:
  • Analog Devices ADuC831: The internal RC clock (32768 Hz) is used for the watchdog timer. This was incorrectly documented in the first datasheets.
  • Dallas Semiconductor Devices: The Watchdog EWT reset is now performed only on power-up reset and not on every reset.
  • Winbond Devices: The Watchdog EWT reset is now performed only on power-up reset and not on every reset.
• [uVision2 Debugger]
  Corrected problems viewing local variables in projects linked with the LX51 Extended Linker/Locater.
• [C51 Compiler]
  Corrected problems in Dallas Contiguous Mode with *(*ptr++) type constructs and far pointer initialization at file level.
• [CX51 Compiler]
  Corrected problems for Philips MX when with far/generic pointer assignments are reuse in the next statement, for example:

    unsigned char far * far pbMemory;
    unsigned long volatile ulAddress;
  
    pbMemory += 1L;          // uses ?C?PSTPTR to save the result
    ulAddress = pbMemory;    // uses wrong result of the previous ?C?PSTPTR library function

• [C51 Compiler]
  Corrected problems with SRC output on extended 8051 platforms like Dallas Contiguous Mode or Philips MX.
• [C51 Compiler]
  Added the ability to locate far memory variables in HDATA memory using the _at_ keyword.
• [LX51 Linker]
  Improved memory allocation in linker code packing to reduce the size of segment gaps when the SEGMENTS directive is used with assembler segments.
• [Ax51 Macro Assembler]
  Added the DEFINE command line directive. This directive allows you to supply C preprocessor on the command line. The syntax is identical to that of the Cx51 Compiler.
• [Monitor-390]
  Corrected problems with xdata memory updates. Added support for Dallas 400 and Dallas 5240 devices.
• [ISD51 In-System Debugger - Version 2]
  Corrected a problem that caused serial break to fail when configured for non-Flash breakpoints. Added example for TI MSC121x devices in the \KEIL\C51\EXAMPLES\TI MSC121X folder.