HP 64783A, User Manual

Page: 195 / 816

Using temporary and permanent breakpoints
When you set a temporary execution breakpoint, the emulator creates the
breakpoint as described in the preceding paragraphs. When the breakpoint
instruction is executed, the emulator breaks to the monitor and removes the
breakpoint. Now you can execute that portion of program code as often as you like
and the breakpoint will not occur again, unless you enable it again.
When you set a permanent breakpoint, the emulator will process it the same as a
temporary breakpoint, but when the breakpoint instruction is executed, the original
instruction will only replace the breakpoint instruction during its next execution.
This allows you to step through the original instruction one time. After your first
step, the BKPT instruction will replace the original instruction again so that the
breakpoint will occur the next time the breakpoint address is hit.
Permanent breakpoints remain in effect until you explicitly disable or remove them.
Permanent breakpoints are available when using version A.04.00 or greater of the
emulation system firmware.
Chapter 4: Using the Emulator
Using Execution Breakpoints
165