Instruction formats and opcodes instruction fields, Popn d6.e:d7.e – Freescale Semiconductor StarCore SC140 User Manual
Page 665
POPN
SC140 DSP Core Reference Manual
A-351
Status and Conditions that Affect Instruction
Status and Conditions Changed By Instruction
Example
popn d6.e:d7.e
Instruction Formats and Opcodes
Instruction Fields
POPN De
Restores data register extension pairs, even registers, and loop start registers from the normal stack. Data
register extension pairs are popped the same as even numbered registers.
POPN Do
Restores modifier control, odd registers, and loop counter registers from the normal stack.
Register Address
Bit Name
Description
SR[18]
EXP
Determines execution working mode.
Register Address
Bit Name
Description
Ln
L
Pops of extensions restore the Ln bit in the destination register. Pops to
data registers clear the Ln bit.
Register/Memory Address
Before
After
NSP
$00000010
$00000008
$00000008
$000000FF
L6:D6
$0:$FF00000000
L7:D7
$0:$0000000000
Instruction
Words
Cycles
1
Note 1: An extra cycle is added if the shadow SP is not valid when the POP instruction is executed. See
Section 5.3.3, “Shadow Stack Pointer Registers.”
Type
Opcode
15
8
7
0
POPN De
1
1
4
1
0
0
1
E
E
E
0
0
0
1
E
0
1
E
1
15
8
7
0
POPN Do
1
1
4
1
0
0
1
e
e
e
1
0
0
1
e
0
1
e
1