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Tools (65)

reserved bits checker

SYSTEM ONLINE

Register Value (HEX)

OK (NO ERRORS)
Mask Definition (Click top buttons)
310
300
290
280
270
260
250
240
230
220
210
200
190
180
170
160
150
140
130
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110
100
90
80
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50
40
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10
00

📖 How to use Reserved Bits Checker?

Reserved Bits Checker is used to verify if your precisely calculated HEX mask accidentally violates "forbidden" territories in the microcontroller memory. Writing to "Reserved" bits (marked in documentation as "Must be kept at reset value") causes unstable processor behavior.

  • The top bar of rectangles above the bits defines the Reservation Mask. By default, bits are not reserved (-).
  • Clicking on a rectangle cyclically changes the rule: Must be 0 → Must be 1 → No Rule.
  • Enter your HEX in the field at the top. If any bit violates your reservation map (e.g., you enter a one where a 0 must be), the screen will flash red!