TM4C1237D5PZ Datasheet, PDF (191/1306 Pages) Texas Instruments – Tiva Microcontroller

Tiva^™ TM4C1237D5PZ Microcontroller
Register 92: Floating-Point Context Control (FPCC), offset 0xF34
The FPCC register sets or returns FPU control data.
Floating-Point Context Control (FPCC)
Base 0xE000.E000
Offset 0xF34
Type RW, reset 0xC000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
ASPEN LSPEN
reserved
Type RW
RW
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
MONRDY reserved BFRDY MMRDY HFRDY THREAD reserved USER LSPACT
Type RO
RO
RO
RO
RO
RO
RO
RW
RO
RW
RW
RW
RW
RO
RW
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31
30
29:9
8
7
6
5
Name
ASPEN
LSPEN
reserved
MONRDY
reserved
BFRDY
MMRDY
Type
RW
RW
RO
RW
RO
RW
RW
Reset
1
Description
Automatic State Preservation Enable
When set, enables the use of the FRACTV bit in the CONTROL register
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.
Important: ^{Two bits control when FPCA can be enabled: the ASPEN}
bit in the Floating-Point Context Control (FPCC)
register and the DISFPCA bit in the Auxiliary Control
(ACTLR) register.
1
0x00
0
0
0
0
Lazy State Preservation Enable
When set, enables automatic lazy state preservation for floating-point
context.
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
Monitor Ready
When set, DebugMonitor is enabled and priority permits setting
MON_PEND when the floating-point stack frame was allocated.
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
Bus Fault Ready
When set, BusFault is enabled and priority permitted setting the BusFault
handler to the pending state when the floating-point stack frame was
allocated.
Memory Management Fault Ready
When set, MemManage is enabled and priority permitted setting the
MemManage handler to the pending state when the floating-point stack
frame was allocated.
June 12, 2014
191
Texas Instruments-Production Data