Development Flow
2.3 Using C-SPY
Refer to Appendix C for a description of FET-specific menus within C-SPY.
2.3.1Breakpoint Types
The C-SPY breakpoint mechanism makes use of a limited number of on-chip debugging resources (specifically, N breakpoint registers, refer to Table 2-1 below). When N or fewer breakpoints are set, the application runs at full device speed (or “Realtime”). When greater than N breakpoints are set and Use Virtual Breakpoints is enabled (FET DEBUGGER->SETUP->USE VIRTUAL BREAKPOINTS), the application runs under the control of the host PC; the system operates at a much slower speed, but offers unlimited software breakpoint (or “Non-Realtime”). During Non-Realtime mode, the PC effectively repeatedly single steps the device and interrogates the device after each operation to determine if a breakpoint has been hit.
Both (code) address and data (value) breakpoints are supported. Data breakpoints and range breakpoints each require two address breakpoints.
Table 2-1. Number of device breakpoints, and other emulation features.
Device | Breakpoints | Range | Clock | State | Trace |
| (N) | Breakpoints | Control | Sequencer | Buffer |
MSP430F11x1 | 2 | | | | |
MSP430F11x2 | 2 | | | | |
MSP430F12x | 2 | | | | |
MSP430F12x2 | 2 | | | | |
MSP430F13x | 3 | X | | | |
MSP430F14x | 3 | X | | | |
MSP430F15x | 8 | X | X | X | X |
MSP430F16x | 8 | X | X | X | X |
MSP430F161x | 8 | X | X | X | X |
MSP430F41x | 2 | | X | | |
MSP430F42x | 2 | | X | | |
MSP430F43x | 8 | X | X | X | X |
MSP430F44x | 8 | X | X | X | X |
MSP430FE42x | 2 | | X | | |
MSP430FG43x | 2 | | X | | |
MSP430FW42x | 2 | | X | | |
2.3.2Using Breakpoints
If C-SPY is started with greater than N breakpoints set and virtual breakpoints are disabled, a message will be output that informs the user that only N (Realtime) breakpoints are enabled (and one or more breakpoints are disabled). Note that the workbench permits any number of breakpoints to be set, regardless of the USE VIRTUAL BREAKPOINTS setting of C-SPY. If virtual breakpoints are disabled, a maximum of N breakpoints can be set within C- SPY.
RESET’ing a program temporarily requires a breakpoint if PROJECT- >OPTIONS->DEBUGGER->SETUP->RUN TO is enabled. Refer to FAQ, Debugging #30).
