OPERATING INSTRUCTIONS
M68HC11EVBU/D
4-13
BR
Breakpoint Set
4.6.3 Breakpoint Set
BR [-][<address>]...
where:
[-] by itself
removes (clears) all breakpoints.
[-] proceeding [<address>]...
removes individual or multiple addresses from breakpoint
table.
The BR command sets the address into the breakpoint address table. During program execution,
a halt occurs to the program execution immediately preceding the execution of any instruction
address in the breakpoint table. A maximum of four breakpoints may be set. After setting the
breakpoint, the current breakpoint addresses, if any, are displayed. Whenever the G, CALL, or P
commands are invoked, the monitor program inserts breakpoints into the user code at the address
specified in the breakpoint table.
Breakpoints are accomplished by the placement of a software interrupt (SWI) at each address
specified in the breakpoint address table. The SWI service routine saves and displays the internal
machine state, then restores the original opcodes at the breakpoint locations before returning
control back to the monitor program.
SWI opcodes cannot be executed or breakpointed in user code because the monitor program uses
the SWI vector. RAM or EEPROM locations can be breakpointed.
Command Formats
Description
BR
Display all current breakpoints.
BR <address>
Set breakpoint.
BR <addr1> <addr2> ...
Set several breakpoints.
BR -
Remove all breakpoints.
BR -<addr1> <addr2>...
Remove <addr1> and add <addr2>.
BR <addr1> – <addr2>...
Add <addr1>, clear all entries, then add <addr2>.
BR <addr1> -<addr2>...
Add <addr1>, then remove <addr2>.
Содержание M68HC11EVBD
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