LM3S1651 Datasheet, PDF (153/1033 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Stellaris^® LM3S1651 Microcontroller
Bit/Field
12
11
10
9
Name
BSTKE
BUSTKE
IMPRE
PRECISE
Type
R/W1C
R/W1C
R/W1C
R/W1C
Reset
0
0
0
0
Description
Stack Bus Fault
Value Description
0 No bus fault has occurred on stacking for exception entry.
1 Stacking for an exception entry has caused one or more bus
faults.
When this bit is set, the SP is still adjusted but the values in the context
area on the stack might be incorrect. A fault address is not written to
the FAULTADDR register.
This bit is cleared by writing a 1 to it.
Unstack Bus Fault
Value Description
0 No bus fault has occurred on unstacking for a return from
exception.
1 Unstacking for a return from exception has caused one or more
bus faults.
This fault is chained to the handler. Thus, when this bit is set, the original
return stack is still present. The SP is not adjusted from the failing return,
a new save is not performed, and a fault address is not written to the
FAULTADDR register.
This bit is cleared by writing a 1 to it.
Imprecise Data Bus Error
Value Description
0 An imprecise data bus error has not occurred.
1 A data bus error has occurred, but the return address in the
stack frame is not related to the instruction that caused the error.
When this bit is set, a fault address is not written to the FAULTADDR
register.
This fault is asynchronous. Therefore, if the fault is detected when the
priority of the current process is higher than the bus fault priority, the
bus fault becomes pending and becomes active only when the processor
returns from all higher-priority processes. If a precise fault occurs before
the processor enters the handler for the imprecise bus fault, the handler
detects that both the IMPRE bit is set and one of the precise fault status
bits is set.
This bit is cleared by writing a 1 to it.
Precise Data Bus Error
Value Description
0 A precise data bus error has not occurred.
1 A data bus error has occurred, and the PC value stacked for
the exception return points to the instruction that caused the
fault.
When this bit is set, the fault address is written to the FAULTADDR
register.
This bit is cleared by writing a 1 to it.
January 21, 2012
153
Texas Instruments-Production Data