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ISD51 User's Guide
Introduction 
Theory of Operation Breakpoints 
Hardware Breakpoints Flash Breakpoints Software Breakpoints Side-Effects Program Integration Function ReferenceBreakpoints
ISD51 supports three different breakpoint technologies:
- Hardware Breakpoints use special on-chip breakpoint registers found on some devices.
- Flash Breakpoints use IAP (In-Application Programming) to replace breakpoint instructions with CALL instructions into ISD51.
- Software Breakpoints are tested after each program instruction.
The following table lists the advantages and limitations of each breakpoint type.
| Breakpoint Type | Advantages | Limitations |
|---|---|---|
| Hardware | Fast program execution speed. | Few breakpoint registers. Only available on some devices. |
| Flash | Fast program execution speed. | CALL instruction replaces three program bytes. Only available on some Flash devices. |
| Software | Supported on all devices. | Slow program execution speed. |
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