Project Configuration

Once you have added ISD51 to your program, you must configure the µVision IDE and Debugger for communication with the 8051 target system.

1. Start the 8051 application on the target system before you start the µVision Debugger.
2. In µVision, select Project — Options for Target — Debug: Use: Keil ISD51 In-System Debugger.
3. Enable Load Application at Startup so that the µVision Debugger loads the symbolic information for your 8051 program.
4. Disable Go till main. Your user program is started by the hardware reset of the 8051 target system.
5. Click Settings to open the ISD51 Driver Settings dialog and configure the ISD51 Options

COM Port Settings

These options configure how the PC serial port communicates with your target hardware.

• Port: PC COM port used to connect to the 8051 target hardware.
• Baudrate: Communication baud rate with the 8051 target hardware.
• RTS and DTR: Level on the RTS or DTR lines of the COM Port.
  • Always High (Active): Signal is always active during µVision Debugger communication.
  • Always Low (Inactive): Signal is always inactive during µVision Debugger communication.
  • Reset High 500ms (Active): Signal is active for 500 mSec on Reset Command of µVision Debugger.
  • Reset Low 500ms (Inactive): Signal is inactive for 500 mSec on Reset Command of µVision Debugger.
  • Reset Pulse: 500ms High, 10ms Low: Signal is active for 500 mSec then inactive for 10ms on Reset Command of µVision Debugger.
  • Reset Pulse: 500ms Low, 10ms High: Signal is inactive for 500 mSec then active for 10ms on Reset Command of µVision Debugger.

Cache Options

The ISD51 driver implements memory caches to speed-up screen updates.

• Disable the cache options to view actual (un-cached) values of DATA (and SFR), IDATA, or XDATA space when you halt program execution. This way you can be certain you are viewing the current values of I/O ports, timers, or memory-mapped peripherals.
• Enable the cache options to obtain maximum performance.

Code Breakpoint Options

This option selects whether or not ISD51 uses software breakpoints, hardware breakpoints, or a combination of both.

• If your target 8051 device does not support hardware breakpoints, you must select software breakpoints only.
• If your target 8051 device supports hardware breakpoints, you must use software breakpoints when no hardware breakpoints are available.

Miscellaneous Options

• Verify if Application in ROM is identical to current Project: Selects whether or not the µVision ISD51 Debugger Driver compares the program code in the 8051 target with the program code of the current project when initializing ISD51 communications. You may disable this option to speed-up the connection time of the debugger with the target system.
  
  If you do not wish to compare the entire application range or if your application contians configuration areas that should be excluded, you may configure the verify address range with CMP_START and CMP_END in the ISD51.H header file.

ISD51 Identification

This box displays the version number and other status information when the µVision Debugger connects to the ISD51 running on the 8051 target system. You may check this information when you open the ISD51 Driver Settings dialog during debugging.