Texas Instruments TMS320C28x, Reference Manual

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Reference Tables for C2xLP Code Migration Topics
D-15 C2xLP Migration Guidelines
Table D − 10. Code Generation Tools and Syntax Differences
Migration topic C2xLP C28x
1 Mnemonic Source or destination not always
specified.
LACL, source
SACL, destination Instructions are always of the form
mnemonic destination, source
MOV destination,source
2 Direct addressing syntax
− @ symbol
LACL dma MOV ACC, @@dma ; C2xLP mode
MOV ACC, @dma ; 28x mode
@@
− means 128 word data page
@ − means 64 word data page
3 Indirect address
pointer buffer, ARB In indirect addressing, Auxiliary
register will be pointed by ARP
register in ST0. ARB is ARP
pointer buffer in ST1.
MAR *,AR2 ; ARP =AR2
LACL * No ARB equivalent in 28x.
Selected ARx is referenced in the in-
struction itself.
MOV ACC,*AR2
4 New Address pointers
syntax
− *(0
BLDD #4545h,RegA MOV @REGA, *(0:0x4545)
5 Repeat instructions
syntax change
− ||
No additional syntax
RPT #5
NOP
Uses || syntax with repeat instruc-
tions
RPT #5
|| NOP
6 Reserved register names
Application code should
not use these reserved
words ST0, ST1, IFR, IMR, GREG ST0, ST1, AH, AL, PH, PL,T, TL,
XAR0, XAR1, XAR2, XAR3, XAR4,
XAR5, XAR6, XAR7, DP, ST1,
DBGSTAT, IER, PC, RPC
7 Increment/Decrement
syntax change MAR *,AR2
LACL *+
… .
LACL * −
MOV ACC, *AR2++
… ..
MOV ACC, *AR2 −−
8 Shift syntax change LACL dma, 4 MOV ACC,dma <<4