4.8.2.3 Data Breakpoint Configuration Window for XMEGA®

This window provides configuration options related to the data breakpoint for XMEGA devices.

Location

Enter a specific address in RAM (e.g., 0x8004) directly or an expression that evaluates to an address in RAM (e.g., &x). Make sure the expression you enter represents the address of the data to monitor.

Note: Data breakpoints on local variables can result in false hits due to the reuse of stack memory. A workaround is to declare it as static for debugging purposes.

Access Mode

Configure the breakpoint to break on the specific Access Mode. Three types of access modes are supported:

Read - Program breaks on read at a specified location.
Write (Default) - Program breaks on write at a specified location.
Read/Write - Program breaks on read or write at a specified location.

Data Match

Use the Data Match option to configure Data Breakpoint to compare the data at a specified location based on one of the following conditions:

Location content is equal to the value
Location content is greater than the value
Location content is less than or equal to the value
Location content is within the range
Location content is outside the range
Bits of the location is equal to the value
Note: Bit Mask: This is an 8-bit value where bits with '1' are significant, and the bits with '0' are don't care.
In general, for a given value V and bitmask M, the break event is triggered when the value in the location field VL satisfies the following condition:
```
(V) & (M) == (VL) & (M)
```
For example, using Value = 0xA0 and Bit Mask = 0xF0 will trigger a break event when the location field has the values between 0xA0 to 0xAF.

Note: The Condition Value field has to be 1 byte.