ARM VERSION 1.2 - Manual (Page 186)

ARM Instruction Reference
4-76 Copyright © 2000, 2001 ARM Limited. All rights reserved. ARM DUI 0068B
4.8.4 BKPT
Breakpoint.
Syntax
BKPT immed_16
where:
immed_16 is an expression evaluating to an integer in the range 0-65535 (a 16-bit
integer).
immed_16 is ignored by ARM hardware, but can be used by a
debugger to store additional information about the breakpoint.
Usage
The BKPT instruction causes the processor to enter Debug mode. Debug tools can use this
to investigate system state when the instruction at a particular address is reached.
Architectures
This instruction is available in ARM architecture versions 5 and above.
Examples
BKPT 0xF02C
BKPT 640