Texas Instruments TMS320C2XX - Manual (Page 330)

Subtract From Accumulator SUB
7-177 Assembly Language Instructions
Before Instruction After Instruction
ARP 7 ARP 0
AR7 301h AR7 300h
Data Memory Data Memory
301h 04h 301h 04h
ACC X 09h ACC 1 01h
C C
Example 3 SUB #8h ;(SXM = 1: sign-extension mode)
Before Instruction After Instruction
ACC X 07h ACC 0 FFFFFFFFh
C C
Example 4 SUB #0FFFh,4 ;(Left shift by four, SXM = 0)
Before Instruction After Instruction
ACC X 0FFFFh ACC 1 0Fh
C C