Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

188

Breakpoint.
Syntax

BKPT #imm

where:
immis an expression evaluating to an integer in the range 0–255 (8-bit value).
Operation
The BKPT instruction causes the processor to enter Debug state. Debug tools can use this to investigate system 

state when the instruction at a particular address is reached.
imm

 is ignored by the processor. If required, a debugger can use it to store additional information about the 

breakpoint.
The BKPT instruction can be placed inside an IT block, but it executes unconditionally, unaffected by the condition 

specified by the IT instruction.
Condition Flags
This instruction does not change the flags.
Examples

BKPT 0xAB

; Breakpoint with immediate value set to 0xAB (debugger can

; extract the immediate value by locating it using the PC) 

Note:

ARM does not recommend the use of the BKPT instruction with an immediate value set to 0xAB for any purpose other 

than Semi-hosting.

Change Processor State. 
Syntax

CPSeffect iflags

where:
effectis one of:
IE Clears the special purpose register.
ID Sets the special purpose register.
iflagsis a sequence of one or more flags:
i Set or clear PRIMASK.
f Set or clear FAULTMASK. 
Operation
CPS changes the PRIMASK and FAULTMASK special register values. See 

 

for more 

information about these registers.

Restrictions
The restrictions are:



Use CPS only from privileged software, it has no effect if used in unprivileged software