Max2, Transfer two 16-bit, Instruction formats and opcodes – Freescale Semiconductor StarCore SC140 User Manual
Page 561: Operation assembler syntax
MAX2
SC140 DSP Core Reference Manual
A-247
MAX2
Transfer Two 16-Bit
MAX2
Maximum Signed Values (DALU)
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example
max2 d0,d4
Instruction Formats and Opcodes
Note:
** indicates serial grouping encoding.
Operation
Assembler Syntax
If Dg.H > Dh.H, then Dg.H
→ Dh.H
MAX2 Dg,Dh
If Dg.L > Dh.L, then Dg.L
→ Dh.L
MAX2 Dg,Dh
Writes the larger of each of the corresponding portions in a data register pair (Dg and Dh) to the second of
the two registers (Dh). The high and low portions of the two registers are compared independently as 16-bit
signed values and written (or not written) based on the comparison. If the high portion of the first register is
greater than the high portion of the second, the value of the high portion of the first register is written to the
high portion of the second. Otherwise, the high portion of the second register is unchanged. The same
process is applied to the low portions of the two registers with the low portion only being affected. The
extension byte is undefined. Only certain pairs of registers are allowed; see Instruction Fields below.
Register Address
Bit Name
Description
Ln
L
Clears the Ln bit in the destination register.
Register/Memory Address
Before
After
D0
$00 0F43 0023
L4:D4
$0:$00 0FE4 8F22
$0:$00 0FE4 0023
Instruction
Words Cycles Type
Opcode
15
8
7
0
MAX2 Dg,Dh
1
1
1
0
*
1
0
1
1
G G
0
1
1
1
1
1
1
1