Sub2, Subtract two 16-bit values (dalu), Example 2 – Freescale Semiconductor StarCore SC140 User Manual
Page 706: Operation assembler syntax
A-392
SC140 DSP Core Reference Manual
SUB2
SUB2
Subtract Two 16-Bit Values (DALU)
SUB2
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example 1
sub2 d0,d1
Example 2
sub2 d0,d1
Operation
Assembler Syntax
Dn.H – Da.H
→ Dn.H
Dn.L – Da.L
→ Dn.L
SUB2 Da,Dn
SUB2 Da,Dn
Performs a 32-bit subtraction of source register Da from Dn with borrow disabled between bits 15 and 16
so that the high and low words of each register are subtracted separately. The result is stored back in Dn.
The extension byte of the result is undefined.
Register Address
Bit Name
Description
Ln
L
Clears the Ln bit in the destination register.
Register/Memory Address
Before
After
D0
$00 0003 2A14
L1:D1
$0:$FF FFFE 2A18
$0:$FF FFFB 0004
Register/Memory Address
Before
After
D0
$00 7000 8000
L1:D1
$0:$FF 8000 7000
$0:$FF 1000 F000