Jameco Electronics Rabbit 3000 - Manual (Page 334)

User’s Manual 325
C.4.2 Mixed System/User Mode Operation
This mode is similar to the previous mode, but with some portions of the program written
for the System mode—for example, peripheral interrupts where latency is critical. By
keeping the System mode code sections small, potential system crashes are still mini-
mized. An overview of this level of operation is shown in Figure C-3.
Figure C-3. System/User Mode Setup for Mixed Operation
Return from interrupts
Critical
Interrupts
System Mode User Mode
Application
code
User-defined
interrupts
Critical
interrupts
Time-critical
interrupts