Texas Instruments TMS320C28x Reference Manual page 552

ZAP OVC
SYNTAX OPTIONS
ZAP OVC
Operands OVC
Description
Flags and OVC
Modes
Repeat
Example
; Calculate: VarD = sat(VarA + VarB + VarC)
ZAP
MOVL
ADDL
ADDL
SAT
MOVL
overflow counter bits in Status Register 0 (ST0)
Clear the overflow counter (OVC) bits in Status Register 0 (ST0).
The 6-bit overflow counter bits (OVC) are cleared.
This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
OVC
ACC,@VarA
ACC,@VarB
ACC,@VarC
ACC
@VarD,ACC
OPCODE
0101 0110 0101 1100
; Zero overflow counter
; ACC = VarA
; ACC = ACC + VarB
; ACC = ACC + VarC
; Saturate if OVC != 0
; Store saturated result into VarD
ZAP OVC
Clear Overflow Counter
OBJMODE RPT CYC
1 − 1
6-395