Architecture Changes
F-5Migration From C27x to C28x
F.1.2 Full Context Save and Restore
On both C27x and C28x, the registers in Figure F−2 are automatically saved
on the stack on an interrupt or trap operation and automatically restored on an
IRET instruction.
Figure F−2. Full Context Save/Restore
31 16 1 0
T ST0
AH AL
PH PL
AR1 AR0
DP ST1
DBGSTAT IER
PCH PCL
Due to the register changes described in section F.1.1. C28x additional regis-
ters must be saved for a full-context store. Figure F−3 shows the difference
between a C27x and C28x full-context save/restore for an interrupt or trap.
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