TOOLSTICK990DC Silicon Laboratories Inc, TOOLSTICK990DC Datasheet - Page 8

• Manufacturer Part Number: TOOLSTICK990DC
• Description: DAUGHTER CARD TOOLSTCK C8051F990
• Manufacturer: Silicon Laboratories Inc
• Series: ToolStickr
• Type: MCUr

Specifications of TOOLSTICK990DC

• Contents: Daughter Card
• Processor To Be Evaluated: C8051F990
• Processor Series: C8051F9xx
• Interface Type: USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: C8051F990
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1964

To olSt ick-F 990D C
Changing the values of registers does not require recompiling the code and redownloading the firmware. At any
time, the device can be halted and the values of the registers can be changed. After selecting “Go”, the firmware
will continue execution using the new values. This capability greatly speeds up the debugging process. See the
data sheet for the C8051F91x-C8051F90x device family for the definitions and usage for all registers.
The debug windows for other sets of registers are found in the View  Debug Windows  SFR’s menu.
6.5. Enabling and Using Watch Windows
The Debug Windows in the View menu are used to view and modify hardware registers. To view and modify
variables in code, the IDE provides Watch Windows. Just as with register debug windows, variables in the watch
windows are updated each time the device is halted. This section of the User’s Guide explains how to add a
variable to the watch window and modify the variable. In the F990DC_FeaturesDemo example code, the variable
Num_LED_Flashes is a counter that stores the number of times the LED blinks.
1. If the device is running, stop execution using the “Stop” button or use the Debug  Stop menu option.
2. In the File View on the left-hand side of the IDE, double-click on F990DC_FeaturesDemo.c to open the source
3. Scroll to the Timer3_ISR function (line 684) and right-click on the variable “Num_LED_Flashes”. In the context
4. Start and stop the device a few times. See that the value of the Num_LED_Flashes is incremented each time
5. When the device is halted, click on the value field in the watch window and change the value to 0. Then click the
6. Start and stop the device a few times to watch the variable increment starting at 0.
Changing the values of variables does not require recompiling the code and redownloading the firmware. At any
time, the device can be halted and the values of the variables can be changed. The firmware will continue
execution using the new values.
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file.
menu that appears, select “Add Num_LED_Flashes to Watch” and then choose “Default.” On the right-hand
portion of the IDE, the watch window appears and the variable is added. The current value of the variable is
shown to the right of the name.
the LED blinks.
Refresh button or select Debug  Refresh to write the new value to the device.
Rev. 0.2