PM0214 datasheet(238/245 Pages) STMICROELECTRONICS

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Core peripherals

PM0214

238/245

DocID022708 Rev 4

Bit 31

ASPEN: Enables CONTROL<2> setting on execution of a floating-point instruction. This

results in automatic hardware state preservation and restoration, for floating-point context, on

exception entry and exit.

0: Disable CONTROL<2> setting on execution of a floating-point instruction.

1: Enable CONTROL<2> setting on execution of a floating-point instruction.

Bit 30

LSPEN:

0: Disable automatic lazy state preservation for floating-point context.

1: Enable automatic lazy state preservation for floating-point context.

Bits 29:9

Reserved.

Bit 8

MONRDY:

0: DebugMonitor is disabled or priority did not permit setting MON_PEND when the floating-

point stack frame was allocated.

1: DebugMonitor is enabled and priority permits setting MON_PEND when the floating-point

stack frame was allocated.

Bit 7

Reserved.

Bit 6

BFRDY:

0: BusFault is disabled or priority did not permit setting the BusFault handler to the pending

state when the floating-point stack frame was allocated.

1: BusFault is enabled and priority permitted setting the BusFault handler to the pending state

when the floating-point stack frame was allocated.

Bit 5

MMRDY:

0: MemManage is disabled or priority did not permit setting the MemManage handler to the

pending state when the floating-point stack frame was allocated.

1: MemManage is enabled and priority permitted setting the MemManage handler to the

pending state when the floating-point stack frame was allocated.

Bit 4

HFRDY:

0: Priority did not permit setting the HardFault handler to the pending state when the floating-

point stack frame was allocated.

1: Priority permitted setting the HardFault handler to the pending state when the floating-point

stack frame was allocated.

Bit 3

THREAD:

0: Mode was not Thread Mode when the floating-point stack frame was allocated.

1: Mode was Thread Mode when the floating-point stack frame was allocated.

Bit 2

Reserved.

Bit 1

USER:

0: Privilege level was not user when the floating-point stack frame was allocated.

1: Privilege level was user when the floating-point stack frame was allocated.

Bit 1

LSPACT:

0: Lazy state preservation is not active.

1: Lazy state preservation is active. floating-point stack frame has been allocated but saving

state to it has been deferred.

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