Popf – Texas Instruments TMS320C3x User Manual
Page 653
Pop Floating-Point Value
POPF
13-195
Assembly Language Instructions
Syntax
POPF
dst
Operation
*SP––
→
dst1
Operands
dst register (Rn, 0
≤
n
≤
7)
Opcode
31
24 23
16
8 7
0
15
0 0 0
0 1
0
1
1
1
dst
0
0 1
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
Description
The top of the current system stack (32 MSBs) is popped and loaded into the
dst register. The top of the stack is assumed to be a floating-point number. The
POP is performed with a postdecrement of the stack pointer. The eight LSBs
of an extended-precision register (R7–R0) are zero-filled.
Cycles
1
Status Bits
These condition flags are modified only if the destination register is R7 – R0.
LUF
Unaffected
UF
0
LV
Unaffected
N
1 if a negative result is generated; 0 otherwise
Z
1 if a 0 result is generated; 0 otherwise
V
0
C
Unaffected
OVM
Operation is not affected by OVM bit value.
Example
POPF R4
Before Instruction
After Instruction
R4
02 5D2E 0123
R4
5F 2C13 0200
SP
80984A
SP
809849
LUF
0
LUF
0
LV
0
LV
0
UF
0
UF
0
N
0
N
0
Z
0
Z
0
V
0
V
0
C
0
C
0
Data memory
80984Ah
5F2C1302
80984Ah
5F2C1302
6.91186578e+00
5.32544007e+28
5.32544007e+28
5.32544007e+28
Mode Bit