Maxm, Transfer maximum absolute value (dalu), Instruction formats and opcodes – Freescale Semiconductor StarCore SC140 User Manual
Page 565: Operation assembler syntax
MAXM
SC140 DSP Core Reference Manual
A-251
MAXM
Transfer Maximum Absolute Value (DALU)
MAXM
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example
maxm d2,d6
$FFDD = –35, $0022 = +34
Instruction Formats and Opcodes
Note:
** indicates serial grouping encoding.
Operation
Assembler Syntax
If
⏐Dg⏐ > ⏐Dh⏐, then Dg → Dh
MAXM Dg,Dh
If Dg == –Dh, then
⏐Dg⏐→ Dh
MAXM Dg,Dh
Compares the absolute values of a data register pair (Dg and Dh). If the absolute value of the first register
(Dg) is greater than the absolute value of the second (Dh), the value of the first register is written to the
second (Dh). Otherwise, the second register is unchanged. In case Dg and Dh have equal magnitudes but
opposite signs, the destination register Dh is written with the positive value.
Register Address
Bit Name
Description
Ln
L
Clears the Ln bit in the destination register.
Register/Memory Address
Before
After
D2
$FF FFFF FFDD
L6:D6
$0:$00 0000 0022
$0:$FF FFFF FFDD
Instruction
Words Cycles Type
Opcode
15
8
7
0
MAXM Dg,Dh
1
1
1
0
*
1
0
1
1
G G
0
1
1
1
1
1
1
0