Tsteq, Test for equal to zero (dalu), Instruction formats and opcodes – Freescale Semiconductor StarCore SC140 User Manual
Page 728: Instruction fields, Operation assembler syntax
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SC140 DSP Core Reference Manual
TSTEQ
TSTEQ
Test for Equal to Zero (DALU)
TSTEQ
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example
tsteq d1
Instruction Formats and Opcodes
Note:
** indicates serial grouping encoding.
Instruction Fields
Dn
FFF
Single Source/Destination Data Register
Operation
Assembler Syntax
If Dn
== 0, then 1 → T, else 0 → T
TSTEQ Dn
TSTEQ Dn
Sets the T bit in SR if the source data register (Dn) is equal to zero; otherwise, it clears the T bit.
Register Address
Bit Name
Description
SR[1]
T
Set if the source operand is equal to zero and cleared if the source
operand is not equal to zero.
Register/Memory Address
Before
After
D1
$00 0000 0000
SR
$00E4 0000
$00E4 0002
Instruction
Words Cycles Type
Opcode
15
8
7
0
TSTEQ Dn
1
1
1
0
*
1
0
0
1
F
F
F
1
1
0
1
0
0
1
000
D0
010
D2
100
D4
110
D6
001
D1
011
D3
101
D5
111
D7
Note:
This instruction can specify D8-D15 as operands by using a prefix.
Note:
Note: